Bump rack from 2.2.4 to 2.2.8.1

Bumps [rack](https://github.com/rack/rack) from 2.2.4 to 2.2.8.1.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.4...v2.2.8.1)

---
updated-dependencies:
- dependency-name: rack
  dependency-type: direct:development
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -69,7 +69,7 @@ GEM
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
     public_suffix (5.0.0)
-    rack (2.2.4)
+    rack (2.2.8.1)
     rack-test (2.0.2)
       rack (>= 1.3)
     rainbow (3.1.1)
@@ -142,6 +142,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-21
+  x86_64-linux
 
 DEPENDENCIES
   byebug