Bump rack from 2.2.8 to 2.2.9

Bumps [rack](https://github.com/rack/rack) from 2.2.8 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@v2.2.8...v2.2.9)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -272,7 +272,7 @@ GEM
       rack
       redis (~> 4.0)
     racc (1.7.3)
-    rack (2.2.8)
+    rack (2.2.9)
     rack-session (1.0.2)
       rack (< 3)
     rack-test (2.1.0)