Bump rack from 2.2.3 to 2.2.6.3

Bumps [rack](https://github.com/rack/rack) from 2.2.3 to 2.2.6.3.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.3...v2.2.6.3)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -293,7 +293,7 @@ GEM
       stringio
     public_suffix (2.0.5)
     racc (1.7.3)
-    rack (2.2.8)
+    rack (2.2.19)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
     rack-session (1.0.2)