⬇️(eslint-config-people) eslint 9.0.0 -> 8.57.0

Downgrade eslint to 8.57.0.
9.0.0 has breaking changes, the adoption
is still very low (1%), better to wait.

src/frontend/packages/eslint-config-people/package.json

@@ -9,7 +9,7 @@
     "@next/eslint-plugin-next": "14.1.4",
     "@tanstack/eslint-plugin-query": "5.28.11",
     "@typescript-eslint/eslint-plugin": "7.5.0",
-    "eslint": "9.0.0",
+    "eslint": "8.57.0",
     "eslint-config-next": "14.1.4",
     "eslint-config-prettier": "9.1.0",
     "eslint-plugin-import": "2.29.1",