Bump timecop from 0.9.3 to 0.9.4

Bumps [timecop](https://github.com/travisjeffery/timecop) from 0.9.3 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@v0.9.3...v0.9.4)

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

Gemfile.lock

@@ -746,7 +746,7 @@ GEM
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    timecop (0.9.3)
+    timecop (0.9.4)
     tins (1.25.0)
       sync
     to_regexp (0.2.1)