fix: upgrade firebase-functions from 4.4.1 to 4.9.0

Snyk has created this PR to upgrade firebase-functions from 4.4.1 to 4.9.0.

See this package in npm:
firebase-functions

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/6f360e9a-f291-4004-bb14-422e414312f8?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

functions/package-lock.json

@@ -35,7 +35,7 @@
   "dependencies": {
     "@conventional-commits/parser": "0.4.1",
     "conventional-commit-types": "3.0.0",
-    "firebase-functions": "4.4.1",
+    "firebase-functions": "4.9.0",
     "probot": "12.3.1"
   },
   "devDependencies": {