Merge branch 'feature/rouge-2.0.7' into 'master'

bump rouge to 2.0.7

## What does this MR do?
Upgrades Rouge to 2.0.7 for various bugfixes.

## Are there points in the code the reviewer needs to double check?
See the Rouge changelog here: https://github.com/jneen/rouge/blob/v2.0.7/CHANGELOG.md

See merge request !7549

Gemfile.lock

@@ -593,7 +593,7 @@ GEM
       railties (>= 4.2.0, < 5.1)
     rinku (2.0.0)
     rotp (2.1.2)
-    rouge (2.0.6)
+    rouge (2.0.7)
     rqrcode (0.7.0)
       chunky_png
     rqrcode-rails3 (0.1.7)