Merge branch '2.21' into 2.22

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -14,6 +14,7 @@ No changes since 2.22
 
 No changes since 2.21
 
+2.21.6 (14-Jul-2026)
 2.21.5 (06-Jul-2026)
 2.21.4 (28-May-2026)
 2.21.3 (28-Apr-2026)