Fix type hints on sanitize_filename utility

src/tribler/gui/utilities.py

@@ -563,6 +563,6 @@ def get_objects_with_predicate(data_item: Dict, predicate: ResourceType) -> List
     return [stmt["object"] for stmt in data_item.get("statements", ()) if stmt["predicate"] == predicate]
 
 
-def sanitize_filename(filename: str):
+def sanitize_filename(filename: str) -> str:
     """Removes some selected escape characters from the filename and returns the cleaned value."""
     return re.sub(r'[\n\r\t]', '', filename)