text: Title: posargs with `:` crashes virtualenv
  Body: ## Issue
  `posargs` with `:` are not properly passed, `virtualenv` crashes.
  
  ## Environment
  
  Provide at least:
  
  - OS: Ubuntu 20.04
  - `pip list` of the host Python where `tox` is installed:
  ```console
  Package               Version
  --------------------- ---------
  anyio                 3.6.2
  artifacts-keyring     0.3.2
  attrs                 22.2.0
  bleach                5.0.1
  cachetools            5.2.1
  certifi               2022.12.7
  cffi                  1.15.1
  chardet               5.1.0
  charset-normalizer    2.1.1
  click                 8.1.3
  colorama              0.4.6
  commonmark            0.9.1
  cryptography          39.0.0
  distlib               0.3.6
  docutils              0.19
  exceptiongroup        1.1.0
  filelock              3.9.0
  h11                   0.14.0
  html5lib              1.1
  httpcore              0.16.3
  httpx                 0.23.3
  idna                  3.4
  importlib-metadata    6.0.0
  importlib-resources   5.10.2
  iniconfig             2.0.0
  jaraco.classes        3.2.3
  jeepney               0.8.0
  keyring               23.13.1
  more-itertools        9.0.0
  packaging             23.0
  pip                   22.3.1
  pkginfo               1.9.6
  platformdirs          2.6.2
  pluggy                1.0.0
  pycparser             2.21
  pydantic              1.10.4
  Pygments              2.14.0
  pyproject_api         1.4.0
  pytest                7.2.0
  pytest-httpx          0.21.2
  readme-renderer       37.3
  requests              2.28.1
  requests-toolbelt     0.10.1
  rfc3986               1.5.0
  rich                  13.0.1
  SecretStorage         3.3.3
  setuptools            57.5.0
  simpleindex           0.5.0
  simpleindex_artifacts 0.3
  six                   1.16.0
  sniffio               1.3.0
  starlette             0.23.1
  toml                  0.10.2
  tomli                 2.0.1
  tox                   4.2.8
  twine                 4.0.2
  typing_extensions     4.4.0
  urllib3               1.26.14
  uvicorn               0.20.0
  virtualenv            20.17.1
  webencodings          0.5.1
  wheel                 0.38.4
  zipp                  3.11.0
  ```
  
  ## Output of running tox
  
  Provide the output of `tox -rvv`:
  
  ```console
  ROOT: 89 D setup logging to DEBUG on pid 26084 [tox/report.py:221]
  .pkg: 156 I find interpreter for spec PythonSpec(path=/usr/local/bin/python) [virtualenv/discovery/builtin.py:56]
  .pkg: 156 I proposed PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:63]
  .pkg: 156 D accepted PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:65]
  .pkg: 158 D filesystem is case-sensitive [virtualenv/info.py:24]
  .pkg: 180 I find interpreter for spec PythonSpec(path=/usr/local/bin/python) [virtualenv/discovery/builtin.py:56]
  .pkg: 180 I proposed PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:63]
  .pkg: 181 D accepted PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:65]
  .pkg: 184 I find interpreter for spec PythonSpec(path=/usr/local/bin/python) [virtualenv/discovery/builtin.py:56]
  .pkg: 185 I proposed PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:63]
  .pkg: 185 D accepted PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:65]
  .pkg: 189 I find interpreter for spec PythonSpec(path=/usr/local/bin/python) [virtualenv/discovery/builtin.py:56]
  .pkg: 190 I proposed PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:63]
  .pkg: 190 D accepted PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:65]
  .pkg: 204 I find interpreter for spec PythonSpec(path=/usr/local/bin/python) [virtualenv/discovery/builtin.py:56]
  .pkg: 204 I proposed PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:63]
  .pkg: 205 D accepted PythonInfo(spec=CPython3.8.16.final.0-64, exe=/usr/local/bin/python, platform=linux, version='3.8.16 (default, Dec  8 2022, 03:18:29) \n[GCC 10.2.1 20210110]', encoding_fs_io=utf-8-utf-8) [virtualenv/discovery/builtin.py:65]
  usage: virtualenv [--version] [--with-traceback] [-v | -q] [--read-only-app-data] [--app-data APP_DATA] [--reset-app-data] [--upgrade-embed-wheels] [--discovery {builtin}] [-p py] [--try-first-with py_exe]
                    [--creator {builtin,cpython3-posix,venv}] [--seeder {app-data,pip}] [--no-seed] [--activators comma_sep_list] [--clear] [--no-vcs-ignore] [--system-site-packages] [--symlinks | --copies] [--no-download | --download]
                    [--extra-search-dir d [d ...]] [--pip version] [--setuptools version] [--wheel version] [--no-pip] [--no-setuptools] [--no-wheel] [--no-periodic-update] [--symlink-app-data] [--prompt prompt] [-h]
                    dest
  virtualenv: error: argument dest: destination '--junitxml=unit_tests_results.xml --cov=autoavatar --cov-report=xml:coverage.xml' must not contain the path separator (:) as this would break the activation scripts
  ```
  
  ## Minimal example
  
  If possible, provide a minimal reproducer for the issue:
  
  **UPDATE** After doing the investigation, it turned out that one environment influences the other. Here is a minimum `tox.ini` to reproduce the issue:
  `tox.int`:
  ```ini
  [tox]
  minversion = 4.3.1
  
  [testenv:hello]
  commands =
      python ./helloworld.py {posargs:World}
  
  [testenv:dev]
  envdir = {posargs:venv}
  usedevelop = True
  commands =
      python ./helloworld.py World
  
  ```
  `tox -e hello -- x:y`
  ```
  ...
  usage: virtualenv [--version] [--with-traceback] [-v | -q] [--read-only-app-data] [--app-data APP_DATA] [--reset-app-data] [--upgrade-embed-wheels] [--discovery {builtin}] [-p py] [--try-first-with py_exe]
                    [--creator {builtin,cpython3-posix,venv}] [--seeder {app-data,pip}] [--no-seed] [--activators comma_sep_list] [--clear] [--no-vcs-ignore] [--system-site-packages] [--symlinks | --copies] [--no-download | --download]
                    [--extra-search-dir d [d ...]] [--pip version] [--setuptools version] [--wheel version] [--no-pip] [--no-setuptools] [--no-wheel] [--no-periodic-update] [--symlink-app-data] [--prompt prompt] [-h]
                    dest
  virtualenv: error: argument dest: destination 'x:y' must not contain the path separator (:) as this would break the activation scripts
  ```