After PR #13725 replaced the module-level _LOCK_DIR/_LOCK_FILE constants with a dynamic _get_lock_paths() helper, the xdist-isolation fixture needs to patch the function instead of the removed constants.
After PR #13725 replaced the module-level _LOCK_DIR/_LOCK_FILE constants with a dynamic _get_lock_paths() helper, the xdist-isolation fixture needs to patch the function instead of the removed constants.