[Security] Bump rack from 2.2.2 to 2.2.3 (#354)

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>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -106,7 +106,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.3)
-    rack (2.2.2)
+    rack (2.2.3)
     rack-livereload (0.3.16)
       rack
     rake (13.0.1)