Ruff fix after merge (#149)

src/aki_prj23_transparenzregister/config/config_providers.py

@@ -73,7 +73,7 @@ class JsonFileConfigProvider(ConfigProvider):
         """
         if not os.path.isfile(file_path):
             raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), file_path)
-        with open(file_path, mode="r") as file:
+        with open(file_path) as file:
             try:
                 data = json.loads(file.read())
                 self.__data__ = data