Update to commonmark 0.21.0 (was 0.10.0)

gitiles is still using commonmark 0.10.0 from 2017. The latest release
is 0.21.0 from Nov 2022.

Update to the latest version. From the changelog[1], this bring
important performance improvements (7% parsing, 105%[?!] rendering),
support to the latest CommonMark spec (0.30), and many bug fixes.

The code changes came from funronald@. I verified they compile and
pass the tests with the latest versions. Random browsing running gitiles
locally looks fine.

[1] https://github.com/commonmark/commonmark-java/blob/main/CHANGELOG.md

Change-Id: Ifd31434cd0cfafd15581a29ae5b3f76ed2133648

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index d0e9e4e..11821e9 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -74,37 +74,37 @@
     sha1 = "f7be08ec23c21485b9b5a1cf1654c2ec8c58168d",
 )
 
-COMMONMARK_VERSION = "0.10.0"
+COMMONMARK_VERSION = "0.21.0"
 
 # When upgrading commonmark it should also be updated in plugins/gitiles
 maven_jar(
     name = "commonmark",
-    artifact = "com.atlassian.commonmark:commonmark:" + COMMONMARK_VERSION,
-    sha1 = "119cb7bedc3570d9ecb64ec69ab7686b5c20559b",
+    artifact = "org.commonmark:commonmark:" + COMMONMARK_VERSION,
+    sha1 = "c98f0473b17c87fe4fa2fc62a7c6523a2fe018f0",
 )
 
 maven_jar(
     name = "cm-autolink",
-    artifact = "com.atlassian.commonmark:commonmark-ext-autolink:" + COMMONMARK_VERSION,
-    sha1 = "a6056a5efbd68f57d420bc51bbc54b28a5d3c56b",
+    artifact = "org.commonmark:commonmark-ext-autolink:" + COMMONMARK_VERSION,
+    sha1 = "55c0312cf443fa3d5af0daeeeca00d6deee3cf90",
 )
 
 maven_jar(
     name = "autolink",
-    artifact = "org.nibor.autolink:autolink:0.7.0",
-    sha1 = "649f9f13422cf50c926febe6035662ae25dc89b2",
+    artifact = "org.nibor.autolink:autolink:0.10.0",
+    sha1 = "6579ea7079be461e5ffa99f33222a632711cc671",
 )
 
 maven_jar(
     name = "gfm-strikethrough",
-    artifact = "com.atlassian.commonmark:commonmark-ext-gfm-strikethrough:" + COMMONMARK_VERSION,
-    sha1 = "40837da951b421b545edddac57012e15fcc9e63c",
+    artifact = "org.commonmark:commonmark-ext-gfm-strikethrough:" + COMMONMARK_VERSION,
+    sha1 = "953f4b71e133a98fcca93f3c3f4e58b895b76d1f",
 )
 
 maven_jar(
     name = "gfm-tables",
-    artifact = "com.atlassian.commonmark:commonmark-ext-gfm-tables:" + COMMONMARK_VERSION,
-    sha1 = "c075db2a3301100cf70c7dced8ecf86b494458a2",
+    artifact = "org.commonmark:commonmark-ext-gfm-tables:" + COMMONMARK_VERSION,
+    sha1 = "fb7d65fa89a4cfcd2f51535d2549b570cf1dbd1a",
 )
 
 maven_jar(