Bump rack from 3.1.13 to 3.1.14 in /examples/rails_app

Bumps [rack](https://github.com/rack/rack) from 3.1.13 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@v3.1.13...v3.1.14)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.1.14
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

examples/rails_app/Gemfile.lock

@@ -159,7 +159,7 @@ GEM
     puma (6.6.0)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.13)
+    rack (3.1.14)
     rack-session (2.1.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)