Merge branch 'asciidoctor-2-0-12' into 'master'

Upgrade Asciidoctor to 2.0.12

See merge request gitlab-org/gitlab!54121

Gemfile.lock

@@ -81,7 +81,7 @@ GEM
       faraday_middleware (~> 1.0)
       faraday_middleware-multi_json (~> 0.0)
       oauth2 (~> 1.4)
-    asciidoctor (2.0.10)
+    asciidoctor (2.0.12)
     asciidoctor-include-ext (0.3.1)
       asciidoctor (>= 1.5.6, < 3.0.0)
     asciidoctor-kroki (0.2.2)

changelogs/unreleased/asciidoctor-2-0-12.yml

+---
+title: Upgrade Asciidoctor to 2.0.12
+merge_request: 54121
+author: Guillaume Grossetie
+type: changed