Bump rack from 2.1.1 to 2.2.3 in /ansible/docker/rzz

Bumps [rack](https://github.com/rack/rack) from 2.1.1 to 2.2.3.
- [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/2.1.1...2.2.3)

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

ansible/docker/rzz/Gemfile.lock

@@ -13,7 +13,7 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    rack (2.1.1)
+    rack (2.2.3)
     rake (13.0.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)