[Security] Bump rack from 2.1.1 to 2.2.2

Bumps [rack](https://github.com/rack/rack) from 2.1.1 to 2.2.2. **This update includes a security fix.**
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](rack/rack@2.1.1...v2.2.2)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -758,7 +758,7 @@ GEM
     pry-rails (0.3.2)
       pry (>= 0.9.10)
     public_suffix (4.0.3)
-    rack (2.1.1)
+    rack (2.2.2)
     rack-test (0.6.3)
       rack (>= 1.0)
     rack-timeout (0.0.4)