Update notes for submitted changes

* Prepare 5.12.0-SNAPSHOT builds

52/0b6d7dcfd7849e1af438380064c39b83c99bf1

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-by: Matthias Sohn <matthias.sohn@sap.com>
+Submitted-at: Fri, 07 May 2021 06:09:47 -0400
+Reviewed-on: https://git.eclipse.org/r/c/jgit/jgit/+/180280
+Project: jgit/jgit
+Branch: refs/heads/stable-5.12