chore(deps): update dependency @azure/functions to v4

Author: renovate[bot]

package-lock.json

@@ -20,7 +20,7 @@
   "license": "ISC",
   "repository": "github:probot/adapter-azure-functions",
   "devDependencies": {
-    "@azure/functions": "^3.2.0",
+    "@azure/functions": "^4.0.0",
     "@types/jest": "^29.0.0",
     "jest": "^29.0.2",
     "nock": "^13.2.9",