Update dependency @azure/functions to v4

Author: renovate[bot]

benchmark/mock-api/package.json

@@ -10,7 +10,7 @@
     "test": "echo \"No tests yet...\""
   },
   "devDependencies": {
-    "@azure/functions": "3.5.1",
+    "@azure/functions": "4.1.0",
     "@types/node": "17.0.45",
     "@typescript-eslint/parser": "6.9.0",
     "eslint": "8.52.0",