TestArgcomplete.test_complete_custom_completers fails with 3.12.7

[mcepl]

With the upgrade to 3.12.7 tests started to fail, most likely because of large changes to argparse module:

[   42s] =================================== FAILURES ===================================
[   42s] _______________ TestArgcomplete.test_complete_custom_completers ________________
[   42s] 
[   42s] self = <tests.config.test_argcomplete.TestArgcomplete object at 0x7fdb5d39c320>
[   42s] argcomplete_on = None
[   42s] 
[   42s]     def test_complete_custom_completers(self, argcomplete_on):
[   42s]         app = ArgcompleteApp()
[   42s]         # test pre-defined completers for Bool/Enum
[   42s] >       assert set(self.run_completer(app, "app --Application.log_level=")) > {"DEBUG", "INFO"}
[   42s] E       AssertionError: assert {''} > {'DEBUG', 'INFO'}
[   42s] E         
[   42s] E         Extra items in the right set:
[   42s] E         'INFO'
[   42s] E         'DEBUG'
[   42s] 
[   42s] app        = <tests.config.test_argcomplete.ArgcompleteApp object at 0x7fdb5d20fe90>
[   42s] argcomplete_on = None
[   42s] self       = <tests.config.test_argcomplete.TestArgcomplete object at 0x7fdb5d39c320>
[   42s] 
[   42s] tests/config/test_argcomplete.py:157: AssertionError
[   42s] =============================== warnings summary ===============================
[   42s] tests/_warnings.py::tests._warnings.all_warnings
[   42s]   <doctest tests._warnings.all_warnings[1]>:2: RuntimeWarning: bar
[   42s] 
[   42s] -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
[   42s] ============================= slowest 10 durations =============================
[   42s] 0.19s call     tests/config/test_application.py::test_help_output
[   42s] 0.18s call     tests/config/test_application.py::test_help_all_output
[   42s] 0.18s call     tests/config/test_application.py::test_show_config_json_cli
[   42s] 0.17s call     tests/config/test_application.py::test_show_config_cli
[   42s] 0.02s call     tests/config/test_argcomplete.py::TestArgcomplete::test_complete_subcommands
[   42s] 
[   42s] (5 durations < 0.005s hidden.  Use -vv to show these durations.)
[   42s] =========================== short test summary info ============================
[   42s] SKIPPED [1] ../../../../../usr/lib/python3.12/site-packages/_pytest/doctest.py:457: all tests skipped by +SKIP option
[   42s] FAILED tests/config/test_argcomplete.py::TestArgcomplete::test_complete_custom_completers
[   42s] ============= 1 failed, 571 passed, 1 skipped, 1 warning in 1.48s ==============

Complete build log with all packages used and all steps taken to reproduce.

[azjps]

This should be the same issue as kislyuk/argcomplete#507, I assume the fix in argcomplete should be relatively straightforward, this test could be temporarily skipped in the meantime if its blocking anything.