Bump rack from 2.2.3 to 2.2.3.1 in /ruby-rails-sso-example (#35)

Bumps [rack](https://github.com/rack/rack) from 2.2.3 to 2.2.3.1.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.3...2.2.3.1)

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

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ruby-rails-sso-example/Gemfile.lock

@@ -148,7 +148,7 @@ GEM
     puma (4.3.12)
       nio4r (~> 2.0)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-proxy (0.7.2)
       rack
     rack-test (1.1.0)