Fix test after merge conflict (#28616)

Something went wrong when rebasing #28491  and renaming the hook.

Author: kassens

packages/react-dom/src/__tests__/ReactDOMForm-test.js

@@ -1324,7 +1324,7 @@ describe('ReactDOMForm', () => {
 
     let dispatch;
     function App() {
-      const [state, _dispatch, isPending] = useFormState(action, 0);
+      const [state, _dispatch, isPending] = useActionState(action, 0);
       dispatch = _dispatch;
       const pending = isPending ? 'Pending ' : '';
       return <Text text={pending + state} />;

packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMForm-test.js

@@ -914,7 +914,7 @@ describe('ReactFlightDOMForm', () => {
     );
 
     function Form({action}) {
-      const [errorMsg, dispatch] = useFormState(action, null);
+      const [errorMsg, dispatch] = useActionState(action, null);
       return <form action={dispatch}>{errorMsg}</form>;
     }