[Security] Bump rack from 2.2.2 to 2.2.3

Bumps [rack](https://github.com/rack/rack) from 2.2.2 to 2.2.3. **This update includes a security fix.**
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/v2.2.2...2.2.3)

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

Gemfile.lock

@@ -403,7 +403,7 @@ GEM
     public_suffix (4.0.1)
     puma (4.3.5)
       nio4r (~> 2.0)
-    rack (2.2.2)
+    rack (2.2.3)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-attack (5.0.1)