Update to Java 21

Change-Id: I68d241c6a1d8da97f212647a3da2ac3793fe4f72
diff --git a/Changes b/Changes
index 327ecf7..359eec3 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.64.5 2025-11-14
+    - [maintenance] Update to Java 21 (diewald)
+
 0.64.4 2025-09-17
     - [feature] Added --progress option to Krill-Indexer (kupietz)
     - [bugfix] Fixed vc cache tests (kupietz)