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

@@ -58,7 +58,7 @@ GEM
     psych (3.1.0)
     psych (3.1.0-java)
       jar-dependencies (>= 0.1.7)
-    rack (2.2.2)
+    rack (2.2.3)
     rake (13.0.1)
     rchardet (1.8.0)
     rdoc (6.2.1)