CI: Ignore mamba Warning Message on stderr to Prevent JSON Parsing Errors

[rabbull]

This PR addresses the CI issue caused by the deprecated --no-python-version-warning in mamba, which interferes with JSON parsing in tests.

To resolve this:

• Upgraded pytest-docker to version 3.2.0, which introduces the ignore_stderr feature.
• Updated test cases (test_correct_python_version_installed and test_correct_pgsql_version_installed) to include ignore_stderr=True, ensuring that warning messages on stderr do not disrupt JSON parsing.

Hopefully this improvement ensures future robustness against JSON parsing issues caused by warnings in stderr.

Closes #6745.

cc @GeigerJ2, @unkcpz, and @agoscinski.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.08%. Comparing base (8039ad9) to head (82c0b1f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6748   +/-   ##
=======================================
  Coverage   78.08%   78.08%           
=======================================
  Files         564      564           
  Lines       42547    42547           
=======================================
  Hits        33219    33219           
  Misses       9328     9328           

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[unkcpz]

Thanks @rabbull, it is a neat fix, all good for me.

[unkcpz]

Updated test cases (test_correct_python_version_installed and test_correct_pgsql_version_installed) to include ignore_stderr=True, ensuring that warning messages on stderr do not disrupt JSON parsing.

I think it is proper to just ignore the error/warnings as did in this PR. Since the test itself is targeting to test the version but not running the command gives no error.