add backwards compatibility for pytest hook wrapper (microsoft#23781)

fixes microsoft#23780

python_files/vscode_pytest/__init__.py

@@ -888,7 +888,7 @@ def send_post_request(
 
 
 class DeferPlugin:
-    @pytest.hookimpl(wrapper=True)
+    @pytest.hookimpl(hookwrapper=True)
     def pytest_xdist_auto_num_workers(self, config: pytest.Config) -> Generator[None, int, int]:
         """Determine how many workers to use based on how many tests were selected in the test explorer."""
         return min((yield), len(config.option.file_or_dir))