Bump rack from 3.0.6.1 to 3.0.9.1

Bumps [rack](https://github.com/rack/rack) from 3.0.6.1 to 3.0.9.1.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.0.6.1...v3.0.9.1)

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

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

Gemfile.lock

@@ -121,7 +121,7 @@ GEM
       stringio
     public_suffix (5.0.1)
     racc (1.7.1)
-    rack (3.0.6.1)
+    rack (3.0.9.1)
     rack-oauth2 (2.2.0)
       activesupport
       attr_required