fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - firebase-functions from 4.4.1 to 4.9.0.
    See this package in npm: https://www.npmjs.com/package/firebase-functions
  - probot from 12.3.1 to 12.4.0.
    See this package in npm: https://www.npmjs.com/package/probot

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

@@ -35,8 +35,8 @@
   "dependencies": {
     "@conventional-commits/parser": "0.4.1",
     "conventional-commit-types": "3.0.0",
-    "firebase-functions": "4.4.1",
-    "probot": "12.3.1"
+    "firebase-functions": "4.9.0",
+    "probot": "12.4.0"
   },
   "devDependencies": {
     "@octokit/webhooks-types": "7.2.0",