Bump rack from 2.2.2 to 2.2.3 (#89)

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)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     psych (3.1.0)
-    rack (2.2.2)
+    rack (2.2.3)
     rake (12.3.3)
     rdoc (6.2.0)
     rest-client (2.1.0)