chore(deps): Update dependency eslint to >= 9.21.0

Author: renovate[bot]

packages/eslint-config-next/package.json

@@ -12,7 +12,7 @@
   "sideEffects": false,
   "peerDependencies": {
     "@typescript-eslint/eslint-plugin": ">= 7.18.0",
-    "eslint": ">= 8.57.1",
+    "eslint": ">= 9.21.0",
     "eslint-plugin-react": ">= 7.37.2",
     "eslint-plugin-react-hooks": ">= 4.6.2"
   },