Noting update of bundled matrix project plugin

changelog.html

@@ -61,6 +61,10 @@ Upcoming changes</a>
   <li class="rfe">
     Add indicator when build queue is filtered.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-22698">issue 22698</a>)
+  <li class="bug">
+    Update bundled Matrix project plugin to 1.2 fixing issues introduced in 1.561.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-22879">issue 22879</a>,
+    <a href="https://issues.jenkins-ci.org/browse/JENKINS-22798">issue 22798</a>)
 </ul>
 </div><!--=TRUNK-END=-->