lisp/org.el: Update the Version header to 9.6-dev

lisp/org.el

@@ -9,7 +9,7 @@
 ;; Homepage: https://orgmode.org
 ;; Package-Requires: ((emacs "25.1"))
 
-;; Version: 9.5
+;; Version: 9.6-dev
 
 ;; This file is part of GNU Emacs.
 ;;