test: skip invalidCommand argparse fixture on Python 3.14.5+ (#1990)

Python 3.14.5 (released 2026-05-10) reverts the unquoted `choose from`
format in argparse error messages via CPython gh-130750. The checked-in
fixture `test_invalid_command_py_3_14_invalidCommand_.txt` was
generated against 3.14.0-3.14.4 (unquoted), so the test fails when CI
picks up 3.14.5.

Skip only the affected `arg=invalidCommand` parametrization on
3.14.5+ via `pytest.param(..., marks=pytest.mark.skipif(...))`;
`arg=--invalid-arg` is unaffected (its fixture is the "required
arguments" error which uses the metavar, not the choice list). Tracking
a more durable normalization-based fix in #1990.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bearomorphism

tests/test_cli.py

@@ -31,7 +31,17 @@ def test_no_argv(util: UtilFixture, capsys, file_regression):
     "arg",
     [
         "--invalid-arg",
-        "invalidCommand",
+        pytest.param(
+            "invalidCommand",
+            marks=pytest.mark.skipif(
+                (3, 14, 5) <= sys.version_info < (3, 15),
+                reason=(
+                    "Python 3.14.5 restored argparse choice quoting (CPython "
+                    "gh-130750); the checked-in fixture matches the 3.14.0-4 "
+                    "unquoted format. See #1990."
+                ),
+            ),
+        ),
     ],
 )
 @pytest.mark.usefixtures("python_version", "consistent_terminal_output")