Bump rack-timeout from 0.5.2 to 0.6.0 (#1487)

Bumps [rack-timeout](https://github.com/sharpstone/rack-timeout) from 0.5.2 to 0.6.0.
- [Release notes](https://github.com/sharpstone/rack-timeout/releases)
- [Changelog](https://github.com/sharpstone/rack-timeout/blob/master/CHANGELOG.md)
- [Commits](zombocom/rack-timeout@v0.5.2...v0.6.0)

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

Gemfile.lock

@@ -164,7 +164,7 @@ GEM
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rack-timeout (0.5.2)
+    rack-timeout (0.6.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)