Bump rack from 3.1.8 to 3.1.9 in the rails group (#2656)

Bumps the rails group with 1 update: [rack](https://github.com/rack/rack).


Updates `rack` from 3.1.8 to 3.1.9
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.8...v3.1.9)

---
updated-dependencies:
- dependency-name: rack
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: rails
...

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

Gemfile.lock

@@ -245,7 +245,7 @@ GEM
     puma (6.6.0)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.8)
+    rack (3.1.9)
     rack-brotli (2.0.0)
       brotli (>= 0.3)
       rack (>= 3)