Bump rack from 2.1.2 to 2.2.9

Bumps [rack](https://github.com/rack/rack) from 2.1.2 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@2.1.2...v2.2.9)

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

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

Author: dependabot[bot]

Diff for: Gemfile.lock

@@ -232,7 +232,7 @@ GEM
       pry (>= 0.10.4)
     public_suffix (3.0.3)
     puma (3.12.2)
-    rack (2.1.2)
+    rack (2.2.9)
     rack-proxy (0.6.5)
       rack
     rack-test (1.1.0)