message: Fix file leak in unpacker
  Summary: Use python properly.
diff: @@ -844,7 +844,8 @@ class ZipManager:
  z.extractall(self.extracted_apk_dir)
  def set_resource_file_mapping(self, path: str) -> None:
  - mapping = json.loads(open(path).read())
  + with open(path) as f:
  + mapping = json.load(f)
  for k, v in mapping.items():
  self.renamed_files_to_original[v] = k
  