Bump rack from 2.2.7 to 2.2.8.1

Bumps [rack](https://github.com/rack/rack) from 2.2.7 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@v2.2.7...v2.2.8.1)

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

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

Gemfile.lock

@@ -91,7 +91,7 @@ GEM
     parslet (2.0.0)
     prettier_print (1.2.1)
     public_suffix (5.0.1)
-    rack (2.2.7)
+    rack (2.2.8.1)
     rack-livereload (0.3.17)
       rack
     rb-fsevent (0.11.2)