📌(deps) pin eslint to version less than 9

Eslint 9 has been recently released but some related dependencies are
not yet compatible (e.g: @typescript-eslint/parser). So we have to pin
this deps awaiting the support by other deps.

packages/eslint-config-custom/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "@typescript-eslint/eslint-plugin": "7.7.1",
     "@typescript-eslint/parser": "7.7.1",
-    "eslint": "9.1.1",
+    "eslint": "8.57.0",
     "eslint-config-airbnb": "19.0.4",
     "eslint-config-airbnb-typescript": "18.0.0",
     "eslint-config-next": "14.2.3",