Upgrade black version (#7089)

stdlib/http/cookies.pyi

@@ -27,6 +27,7 @@ class Morsel(dict[str, Any], Generic[_T]):
         def set(self, key: str, val: str, coded_val: _T) -> None: ...
     else:
         def set(self, key: str, val: str, coded_val: _T, LegalChars: str = ...) -> None: ...
+
     def setdefault(self, key: str, val: str | None = ...) -> str: ...
     # The dict update can also get a keywords argument so this is incompatible
     @overload  # type: ignore[override]