Use ruff as linter

vcr/util.py

@@ -27,7 +27,7 @@ class CaseInsensitiveDict(MutableMapping):
     """
 
     def __init__(self, data=None, **kwargs):
-        self._store = dict()
+        self._store = {}
         if data is None:
             data = {}
         self.update(data, **kwargs)