Use unquestionably long paths

Author: Tor Colvin

testing/test_pathlib.py

@@ -93,7 +93,7 @@ def renamed_failed(*args):
 
 def test_long_path_during_cleanup(tmp_path):
     """Ensure that deleting long path works (particularly on Windows (#6775))."""
-    path = tmp_path / ("a" * 200)
+    path = tmp_path / ("a" * 300)
     if sys.platform == "win32":
         dirname = path.resolve()
         dirname = "\\\\?\\" + str(path)