Update rails-controller-testing to v1.0.5

This fixes Ruby 2.7 deprecation warnings:
https://github.com/rails/rails-controller-testing/compare/v1.0.4..v1.0.5

Gemfile.lock

@@ -885,10 +885,10 @@ GEM
       bundler (>= 1.3.0)
       railties (= 6.0.3.1)
       sprockets-rails (>= 2.0.0)
-    rails-controller-testing (1.0.4)
-      actionpack (>= 5.0.1.x)
-      actionview (>= 5.0.1.x)
-      activesupport (>= 5.0.1.x)
+    rails-controller-testing (1.0.5)
+      actionpack (>= 5.0.1.rc1)
+      actionview (>= 5.0.1.rc1)
+      activesupport (>= 5.0.1.rc1)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)