Merge branch '216621-cached-scoped-labels-html-are-now-rendered-incorrectly' into 'master'

Resolve "Cached scoped labels HTML are now rendered incorrectly"

Closes #216621

See merge request gitlab-org/gitlab!31139

lib/gitlab/markdown_cache.rb

@@ -3,7 +3,7 @@
 module Gitlab
   module MarkdownCache
     # Increment this number every time the renderer changes its output
-    CACHE_COMMONMARK_VERSION        = 20
+    CACHE_COMMONMARK_VERSION        = 21
     CACHE_COMMONMARK_VERSION_START  = 10
 
     BaseError = Class.new(StandardError)