[Security] Bump rack from 2.0.7 to 2.0.8

Bumps [rack](https://github.com/rack/rack) from 2.0.7 to 2.0.8. **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@2.0.7...2.0.8)

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

Gemfile.lock

@@ -268,7 +268,7 @@ GEM
     public_suffix (3.0.2)
     puma (3.12.2)
     raabro (1.1.6)
-    rack (2.0.7)
+    rack (2.0.8)
     rack-protection (2.0.4)
       rack
     rack-test (1.1.0)