Bump rack in /api/ruby/building-your-first-github-app

Bumps [rack](https://github.com/rack/rack) from 2.2.2 to 2.2.6.2.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.2...v2.2.6.2)

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

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

Author: dependabot[bot]

api/ruby/building-your-first-github-app/Gemfile.lock

@@ -1,5 +1,5 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
@@ -11,7 +11,7 @@ GEM
     octokit (4.9.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (3.0.2)
-    rack (2.2.2)
+    rack (2.2.6.2)
     rack-protection (2.0.3)
       rack
     sawyer (0.8.1)