Bump rack from 2.2.8 to 2.2.8.1 (#37)

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
...

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Gemfile.lock

@@ -65,7 +65,7 @@ GEM
  ast (~> 2.4.1)
  racc
  racc (1.7.1)
- rack (2.2.8)
+ rack (2.2.8.1)
  rack-accept (0.4.5)
  rack (>= 0.4)
  rack-test (2.1.0)