Bump rack from 2.2.4 to 3.0.8

Bumps [rack](https://github.com/rack/rack) from 2.2.4 to 3.0.8.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.4...v3.0.8)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -41,7 +41,7 @@ GEM
     parser (3.1.2.0)
       ast (~> 2.4.1)
     racc (1.7.1)
-    rack (2.2.4)
+    rack (3.0.8)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest