Update mypy to 1.18.1 (#14699)

stubs/gevent/gevent/local.pyi

@@ -11,7 +11,7 @@ class local:
         "_local_type",
         "_local_type_set_or_del_descriptors",
     )
-    def __init__(self, *args: object, **kwargs: object) -> None: ...
+    def __new__(cls, *args: object, **kwargs: object) -> Self: ...
     def __copy__(self) -> Self: ...
     def __getattribute__(self, name: str, /) -> Any: ...
     def __delattr__(self, name: str, /) -> None: ...