Merge branch 'upgrade-sass-rails' into 'master'

Upgrade sass-rails

## What does this MR do?

Upgrades sass-rails from 5.0.4 to 5.0.5. Includes support for Rails 5.

Changelog: https://github.com/rails/sass-rails/releases

Working toward #14286 

See merge request !5030

Gemfile.lock

@@ -632,8 +632,8 @@ GEM
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
     sass (3.4.22)
-    sass-rails (5.0.4)
-      railties (>= 4.0.0, < 5.0)
+    sass-rails (5.0.5)
+      railties (>= 4.0.0, < 6)
       sass (~> 3.1)
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)