Update rouge to v3.7.0

This adds support for a number of new languages (e.g. Ada)
and fixes a number of lexers:
https://github.com/rouge-ruby/rouge/compare/v3.5.1..v3.7.0

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64625

Gemfile

@@ -134,7 +134,7 @@ gem 'wikicloth', '0.8.1'
 gem 'asciidoctor', '~> 2.0.10'
 gem 'asciidoctor-include-ext', '~> 0.3.1', require: false
 gem 'asciidoctor-plantuml', '0.0.9'
-gem 'rouge', '~> 3.5'
+gem 'rouge', '~> 3.7'
 gem 'truncato', '~> 0.7.11'
 gem 'bootstrap_form', '~> 4.2.0'
 gem 'nokogiri', '~> 1.10.3'

Gemfile.lock

@@ -780,7 +780,7 @@ GEM
     retriable (3.1.2)
     rinku (2.0.0)
     rotp (2.1.2)
-    rouge (3.5.1)
+    rouge (3.7.0)
     rqrcode (0.7.0)
       chunky_png
     rqrcode-rails3 (0.1.7)
@@ -1208,7 +1208,7 @@ DEPENDENCIES
   redis-rails (~> 5.0.2)
   request_store (~> 1.3)
   responders (~> 2.0)
-  rouge (~> 3.5)
+  rouge (~> 3.7)
   rqrcode-rails3 (~> 0.1.7)
   rspec-parameterized
   rspec-rails (~> 3.8.0)

changelogs/unreleased/sh-update-rouge-3-7-0.yml

+---
+title: Update rouge to v3.7.0
+merge_request: 31254
+author:
+type: other

spec/features/markdown/copy_as_gfm_spec.rb

@@ -798,7 +798,7 @@ describe 'Copy as GFM', :js do
       context 'selecting one word of text' do
         it 'copies as inline code' do
           verify(
-            '.line[id="LC27"] .s2',
+            '.line[id="LC27"] .nl',
             '`"bio"`'
           )