fix: add missing useState import in test fixture

Author: PGrayCS

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-use-memo-unused-state.js

@@ -1,5 +1,5 @@
 // @validatePreserveExistingMemoizationGuarantees
-import {useCallback, useTransition} from 'react';
+import {useCallback, useState, useTransition} from 'react';
 
 function useFoo() {
   const [, /* state value intentionally not captured */ setState] = useState();