Bump rack from 2.2.3 to 2.2.8

Bumps [rack](https://github.com/rack/rack) from 2.2.3 to 2.2.8.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.3...v2.2.8)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -44,7 +44,7 @@ GEM
     nokogiri (1.12.3-x86_64-linux)
       racc (~> 1.4)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails-dom-testing (2.0.3)