text: Title: Cannot close the proxy
  Body: <!-- Summary. -->
  In windows pycharm jupyterlab when i open windows system proxy requests will use the proxy i set on windows system.
  but cannot close this proxy direct to the internet . I try  
  ```python
  response = requests.post(url, headers=headers, json=data, proxies=None)
  response = requests.post(url, headers=headers, json=data, proxies={})
  response = requests.post(url, headers=headers, json=data, proxies="")
  ```
  can't work
  ## Expected Result
  
  don't use proxy I set on windows
  <!-- What you expected. -->
  ## Actual Result
  I can check this connection on clash
  <!-- What happened instead. -->
  
  ## Reproduction Steps
  windows  requests                  2.31.0
  use pycharm and jupyter
  ```python
  import requests
  response = requests.post(url, headers=headers, json=data, proxies=None)# I try None {} "" []
  ```
  
  ## System Information
  
      $ python -m requests.help
  
  ```json
  {
    "chardet": {
      "version": null
    },
    "charset_normalizer": {
      "version": "2.0.4"
    },
    "cryptography": {
      "version": "41.0.7"
    },
    "idna": {
      "version": "3.4"
    },
    "implementation": {
      "name": "CPython",
      "version": "3.11.5"
    },
    "platform": {
      "release": "10",
      "system": "Windows"
    },
    "pyOpenSSL": {
      "openssl_version": "300000c0",
      "version": "23.2.0"
    },
    "requests": {
      "version": "2.31.0"
    },
    "system_ssl": {
      "version": "300000c0"
    },
    "urllib3": {
      "version": "1.26.18"
    },
    "using_charset_normalizer": true,
    "using_pyopenssl": true
  }
  
  ```
  
  <!-- This command is only available on Requests v2.16.4 and greater. Otherwise,
  please provide some basic information about your system (Python version,
  operating system, &c). -->
  