fix: fix name argument type anotation in Decoy.mock

Author: mcous

decoy/__init__.py

@@ -30,7 +30,7 @@ def mock(self, *, func: FuncT) -> FuncT:
 
     # TODO(mc, 2021-11-14): make `name` required for specless mocks in v2.0
     @overload
-    def mock(self, *, name: Optional[Any] = None, is_async: bool = False) -> Any:
+    def mock(self, *, name: Optional[str] = None, is_async: bool = False) -> Any:
         ...
 
     def mock(