Add missing return type annotation

Author: zyzzyxdonta

src/hermes/commands/harvest/file_exists.py

@@ -276,7 +276,7 @@ def _filter_files(self, files_tags: Dict[Path, Set[str]]) -> Dict[Path, Set[str]
         return {path: tags for path, tags in files_tags.items() if tags}
 
 
-def _path_matches_pattern(path: Path, pattern: str):
+def _path_matches_pattern(path: Path, pattern: str) -> bool:
     """Case-insensitive path matching.
 
     Python 3.12 introduces the ``case_sensitive`` kwarg to the ``match`` function. For