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](https://github.com/rack/rack/compare/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

@@ -18,7 +18,7 @@ GEM
     pry-doc (1.4.0)
       pry (~> 0.11)
       yard (~> 0.9.11)
-    rack (2.2.6.2)
+    rack (2.2.6.3)
     rack-protection (2.2.4)
       rack
     ruby2_keywords (0.0.5)