Bump timecop from 0.9.1 to 0.9.4

Bumps [timecop](https://github.com/travisjeffery/timecop) from 0.9.1 to 0.9.4.
- [Release notes](https://github.com/travisjeffery/timecop/releases)
- [Changelog](https://github.com/travisjeffery/timecop/blob/master/History.md)
- [Commits](travisjeffery/timecop@v0.9.1...v0.9.4)

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

Gemfile.lock

@@ -322,7 +322,7 @@ GEM
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    timecop (0.9.1)
+    timecop (0.9.4)
     tins (1.21.1)
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)