Bump rack from 2.0.6 to 2.2.6.4

Bumps [rack](https://github.com/rack/rack) from 2.0.6 to 2.2.6.4.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.0.6...v2.2.6.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     puma (3.11.4)
-    rack (2.0.6)
+    rack (2.2.6.4)
     rack-contrib (2.1.0)
       rack (~> 2.0)