Bump rack from 2.2.6.4 to 2.2.9

Bumps [rack](https://github.com/rack/rack) from 2.2.6.4 to 2.2.9.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.6.4...v2.2.9)

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

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

Gemfile.lock

@@ -26,7 +26,7 @@ GEM
       method_source (~> 0.9.0)
     puma (5.6.8)
       nio4r (~> 2.0)
-    rack (2.2.6.4)
+    rack (2.2.9)
     rack-protection (2.2.3)
       rack
     rack-test (1.1.0)