Bump rack from 1.6.4 to 1.6.13

Bumps [rack](https://github.com/rack/rack) from 1.6.4 to 1.6.13.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](rack/rack@1.6.4...1.6.13)

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

Gemfile.lock

@@ -163,7 +163,7 @@ GEM
       mime-types
       mimemagic (~> 0.3.0)
     pg (0.18.4)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)