Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [  File "/builddir/build/BUILD/python-twisted-24.11.0-build/twisted-twisted-24.11.0/src/twisted/conch/test/test_cftp.py", line 212, in ListingTests
    locale.setlocale(locale.LC_ALL, currentLocale)
  File "/usr/lib64/python3.13/locale.py", line 615, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting]: [Test is trying to set a locale to a `locale.LC_ALL`, but that locale setting that is attempted is not supported in the default mock environment.]
=============
[--setenv=LANG=C.UTF-8]: [Default LANG used also for locale is set to C.UTF-8 which is less featureful than a specific language UTF-8.]

Issue: Python test of name "twisted.conch.test.test_cftp" in %check failed with "locale.Error: unsupported locale setting" when trying to set "locale.LC_ALL" for the locale.
Resolution: Add `export LC_ALL=en_US.UTF-8` before tests execution to force UTF-8 locale for LC_ALL.