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.
- [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[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -89,7 +89,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.2)
     puma (3.11.2)
-    rack (2.0.7)
+    rack (2.0.8)
     rack-proxy (0.6.4)
       rack
     rack-test (0.8.2)