Udpate release notes wrt "master"->"main" branch renaming

cowtowncoder · cowtowncoder · commit 9d084352f36e · 2025-05-28T18:48:17.000-07:00
diff --git a/release-notes/VERSION b/release-notes/VERSION
@@ -9,6 +9,7 @@ Releases
 #122: RFC-4122 Obsoleted by RFC-9562 (document change)
  (pointed out by @akefirad)
 - Update to `oss-parent` v68 to switch to Central Portal publishing
+- Branch "master" renamed as "main"
 
 5.1.0 (02-Jun-2024)
 
