fix mypy error

Author: jonathandung

stubs/jwcrypto/jwcrypto/jwk.pyi

@@ -243,7 +243,7 @@ class JWK(dict[str, Any]):
     @classmethod
     def from_password(cls, password: str) -> Self: ...
     def setdefault(self, key: str, default: _T | None = None) -> _T: ...
-    def __hash__(self) -> int: ...
+    def __hash__(self) -> int: ...  # type: ignore[override]
     def __eq__(self, other: object, /) -> bool: ...
 
 class JWKSet(dict[Literal["keys"], set[JWK]]):