Bump rails-controller-testing from 1.0.3 to 1.0.4 (#9440)

Bumps [rails-controller-testing](https://github.com/rails/rails-controller-testing) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/rails/rails-controller-testing/releases)
- [Commits](https://github.com/rails/rails-controller-testing/compare/v1.0.3...v1.0.4)

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

Gemfile.lock

@@ -446,7 +446,7 @@ GEM
       bundler (>= 1.3.0)
       railties (= 5.2.1.1)
       sprockets-rails (>= 2.0.0)
-    rails-controller-testing (1.0.3)
+    rails-controller-testing (1.0.4)
       actionpack (>= 5.0.1.x)
       actionview (>= 5.0.1.x)
       activesupport (>= 5.0.1.x)