chore(deps): bump commonmarker from v0.18.3 to v2.4.1

Gemfile

@@ -6,7 +6,7 @@ gem "kramdown", :platforms => :jruby
 gem "RedCloth"
 # using a tag version here because 0.18.3 was not published by the author to encourage users to upgrade.
 # however we want to bump up to this version since this has a security patch
-gem "commonmarker", git: "https://github.com/gjtorikian/commonmarker.git", tag: "v0.18.3"
+gem "commonmarker", git: "https://github.com/gjtorikian/commonmarker.git", tag: "v2.4.1"
 gem "rdoc", "~> 6.13.1"
 gem "org-ruby", "0.9.12"
 gem "creole", "~>0.5.0"

Gemfile.lock

@@ -1,10 +1,10 @@
 GIT
   remote: https://github.com/gjtorikian/commonmarker.git
-  revision: 2838ebaa83ee0081d481c21f3bc0e4cb3e8de9da
-  tag: v0.18.3
+  revision: 1f73707656d1b57f46ac9b554356320b6611e4c5
+  tag: v2.4.1
   specs:
-    commonmarker (0.18.3)
-      ruby-enum (~> 0.5)
+    commonmarker (2.4.1)
+      rb_sys (~> 0.9)
 
 PATH
   remote: .
@@ -81,12 +81,13 @@ GEM
       stringio
     racc (1.8.1)
     rake (13.2.1)
+    rake-compiler-dock (1.9.1)
+    rb_sys (0.9.117)
+      rake-compiler-dock (= 1.9.1)
     rdoc (6.13.1)
       psych (>= 4.0.0)
     redcarpet (3.6.1)
     rexml (3.4.2)
-    ruby-enum (0.9.0)
-      i18n
     rubypants (0.7.1)
     rugged (1.9.0)
     sanitize (6.1.3)