chore: update ESLint to v9

.eslintplugin/index.mjs

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {builtinRules} from 'eslint/use-at-your-own-risk';
+import typescriptEslint from 'typescript-eslint';
+
+const rules = {
+  'no-restricted-types-eventually':
+    typescriptEslint.plugin.rules['no-restricted-types'],
+  'prefer-rest-params-eventually': builtinRules.get('prefer-rest-params'),
+  'prefer-spread-eventually': builtinRules.get('prefer-spread'),
+};
+
+export default {rules};