Skip obsolete pytest-black discovery case

pytest-black does not support pytest 8.1 or newer, and pytest-ruff already covers discovery of plugin-generated test items. Skip the obsolete Black-specific parameter instead of maintaining a local replacement for the third-party plugin.

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

Author: eleanorjboyd

python_files/tests/pytestadapter/.data/2496-black-formatter/conftest.py

@@ -476,10 +476,13 @@ def test_config_sub_folder():
             expected_discovery_test_output.ruff_test_expected_output,
             "--ruff",
         ),
-        (
+        pytest.param(
             "2496-black-formatter",
             expected_discovery_test_output.black_formatter_expected_output,
             "--black",
+            marks=pytest.mark.skip(
+                reason="pytest-black does not support pytest 8.1 or newer"
+            ),
         ),
     ],
 )