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] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -110,7 +110,7 @@ GEM
     parser (2.3.3.1)
       ast (~> 2.2)
     public_suffix (4.0.3)
-    rack (2.2.2)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rake (13.0.1)