Bump turbolinks from 2.5.3 to 5.2.0

Bumps [turbolinks](https://github.com/turbolinks/turbolinks) from 2.5.3 to 5.2.0.
- [Release notes](https://github.com/turbolinks/turbolinks/releases)
- [Changelog](https://github.com/turbolinks/turbolinks/blob/master/CHANGELOG.md)
- [Commits](https://github.com/turbolinks/turbolinks/commits/v5.2.0)

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

Author: dependabot-support

Gemfile.lock

@@ -315,8 +315,9 @@ GEM
     thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.9)
-    turbolinks (2.5.3)
-      coffee-rails
+    turbolinks (5.2.0)
+      turbolinks-source (~> 5.2)
+    turbolinks-source (5.2.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (4.1.20)