Bump rack from 2.2.8 to 2.2.8.1

Bumps [rack](https://github.com/rack/rack) from 2.2.8 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@v2.2.8...v2.2.8.1)

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

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

Gemfile.lock

@@ -36,7 +36,7 @@ GEM
     minitest (5.20.0)
     pg (1.5.4)
     raabro (1.4.0)
-    rack (2.2.8)
+    rack (2.2.8.1)
     rake (13.0.3)
     redis (4.8.1)
     redis-namespace (1.11.0)