build(deps): bump rack in /appengine/standard-hello_world (#1561)

Bumps [rack](https://github.com/rack/rack) from 3.1.10 to 3.1.14.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.10...v3.1.14)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.1.14
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

appengine/standard-hello_world/Gemfile.lock

@@ -6,7 +6,7 @@ GEM
     logger (1.6.6)
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
-    rack (3.1.10)
+    rack (3.1.14)
     rack-protection (4.1.0)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)