Update dependency eslint to v9

Author: renovate[bot]

package.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@typescript-eslint/eslint-plugin": "^8.0.0",
-    "eslint": "^8.56.0",
+    "eslint": "^9.0.0",
     "eslint-config-google": "^0.14.0",
     "eslint-config-mitodl": "^2.0.0",
     "eslint-config-prettier": "^9.1.0",