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.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](rack/rack@v2.2.2...2.2.3)

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

Gemfile.lock

@@ -91,7 +91,7 @@ GEM
       equatable (~> 0.6)
       tty-color (~> 0.5)
     public_suffix (4.0.5)
-    rack (2.2.2)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rainbow (3.0.0)