fix: handle argparse changes in Python 3.14

[cjwatson]

python/cpython#66436 causes tests/unit/test_main.py::test_help to fail on Python 3.14 as follows:

monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x7f549ac59a70>, capsys = <_pytest.capture.CaptureFixture object at 0x7f549ad9e660>

    @on_supported_platform
    def test_help(monkeypatch, capsys):
        # GIVEN
        monkeypatch.setattr(sys, "argv", ["auditwheel"])

        # WHEN
        retval = main()

        # THEN
        assert retval is None
        captured = capsys.readouterr()
>       assert "usage: auditwheel [-h] [-V] [-v] command ..." in captured.out
E       assert 'usage: auditwheel [-h] [-V] [-v] command ...' in "usage: python3.14 -m pytest [-h] [-V] [-v] command ...\n\nCross-distro Python wheels.\n\npositional arguments:\n  command\n    show         Audit a wheel for external shared library dependencies.\n    repair       Vendor in external shared library dependencies of a wheel. If\n                 multiple wheels are specified, an error processing one wheel\n                 will abort processing of subsequent wheels.\n    lddtree      Analyze a single ELF file (similar to ``ldd``).\n\noptions:\n  -h, --help     show this help message and exit\n  -V, --version  show program's version number and exit\n  -v, --verbose  Give more output. Option is additive\n"
E        +  where "usage: python3.14 -m pytest [-h] [-V] [-v] command ...\n\nCross-distro Python wheels.\n\npositional arguments:\n  command\n    show         Audit a wheel for external shared library dependencies.\n    repair       Vendor in external shared library dependencies of a wheel. If\n                 multiple wheels are specified, an error processing one wheel\n                 will abort processing of subsequent wheels.\n    lddtree      Analyze a single ELF file (similar to ``ldd``).\n\noptions:\n  -h, --help     show this help message and exit\n  -V, --version  show program's version number and exit\n  -v, --verbose  Give more output. Option is additive\n" = CaptureResult(out="usage: python3.14 -m pytest [-h] [-V] [-v] command ...\n\nCross-distro Python wheels.\n\npositional arguments:\n  command\n    show         Audit a wheel for external shared library dependencies.\n    repair       Vendor in external shared library dependencies of a wheel. If\n                 multiple wheels are specified, an error processing one wheel\n                 will abort processing of subsequent wheels.\n    lddtree      Analyze a single ELF file (similar to ``ldd``).\n\noptions:\n  -h, --help     show this help message and exit\n  -V, --version  show program's version number and exit\n  -v, --verbose  Give more output. Option is additive\n", err='').out

tests/unit/test_main.py:41: AssertionError

Monkey-patch things a bit harder so that the output is as we expect.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.24%. Comparing base (4490469) to head (d20569e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #661   +/-   ##
=======================================
  Coverage   95.24%   95.24%           
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  Files          22       22           
  Lines        1829     1829           
  Branches      343      343           
=======================================
  Hits         1742     1742           
  Misses         48       48           
  Partials       39       39           

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