Bump @google-cloud/functions-framework in /scripts/gcb2slack (google#3840)

Bumps [@google-cloud/functions-framework](https://github.com/GoogleCloudPlatform/functions-framework-nodejs) from 4.0.1 to 5.0.0.
- [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@v4.0.1...v5.0.0)

---
updated-dependencies:
- dependency-name: "@google-cloud/functions-framework"
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

scripts/gcb2slack/package-lock.json

@@ -4,7 +4,7 @@
   "description": "Slack integration for Google Cloud Build.",
   "main": "index.js",
   "dependencies": {
-    "@google-cloud/functions-framework": "^4.0.1",
+    "@google-cloud/functions-framework": "^5.0.0",
     "@slack/webhook": "^7.0.6",
     "google-auth-library": "^10.5.0"
   }