fix: fixtures/eslint/package.json & fixtures/eslint/yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AJV-15274295

Author: snyk-bot

fixtures/eslint/package.json

@@ -2,7 +2,7 @@
   "private": true,
   "name": "eslint-playground",
   "dependencies": {
-    "eslint": "4.1.0",
+    "eslint": "9.0.0",
     "eslint-plugin-react-hooks": "link:./proxy"
   },
   "scripts": {