fix(verify): satisfy mypy no-any-return on Commons API response

Author: Seungpyo1007

app/verify/wikipedia_image_backfill.py

@@ -178,7 +178,8 @@ def query(self, host: str, params: dict[str, str]) -> dict[str, Any]:
             f"https://{host}/w/api.php", params={"action": "query", "format": "json", **params}
         )
         response.raise_for_status()
-        return response.json()
+        data: dict[str, Any] = response.json()
+        return data
 
 
 def inspect(url: str, fetcher: CommonsFetcher, name: str = "") -> dict[str, str]: