Bump rack from 2.0.8 to 2.2.3

Bumps [rack](https://github.com/rack/rack) from 2.0.8 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@2.0.8...2.2.3)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
       method_source (~> 0.9.0)
     public_suffix (4.0.1)
     racc (1.5.2)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-cors (1.0.6)