Bump rack from 2.2.6.2 to 2.2.6.3

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 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@v2.2.6.2...v2.2.6.3)

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

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

Gemfile.lock

@@ -460,7 +460,7 @@ GEM
     puma (4.3.12)
       nio4r (~> 2.0)
     racc (1.6.1)
-    rack (2.2.6.2)
+    rack (2.2.6.3)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-protection (2.2.2)