Bump @google-cloud/functions-framework in /scripts/gcb2slack (#3746)

Bumps [@google-cloud/functions-framework](https://github.com/GoogleCloudPlatform/functions-framework-nodejs) from 3.4.5 to 3.4.6.
- [Release notes](https://github.com/GoogleCloudPlatform/functions-framework-nodejs/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/functions-framework-nodejs/blob/main/CHANGELOG.md)
- [Commits](GoogleCloudPlatform/functions-framework-nodejs@v3.4.5...v3.4.6)

---
updated-dependencies:
- dependency-name: "@google-cloud/functions-framework"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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scripts/gcb2slack/package-lock.json

@@ -4,7 +4,7 @@
   "description": "Slack integration for Google Cloud Build.",
   "main": "index.js",
   "dependencies": {
-    "@google-cloud/functions-framework": "^3.4.5",
+    "@google-cloud/functions-framework": "^3.4.6",
     "@slack/webhook": "^7.0.4",
     "google-auth-library": "^9.15.1"
   }