Unnecessary use of a comprehension (#1994)

Author: DimitriPapadopoulos

src/zarr/v2/util.py

@@ -786,4 +786,4 @@ def __contains__(self, key: object) -> bool:
         return key in self._keys
 
     def __repr__(self) -> str:
-        return repr({k: v for k, v in self.items()})
+        return repr(dict(self.items()))