org.el: Fix the "version" keyword in the header

* lisp/org.el: Fix the "version" keyword in the header.

lisp/org.el

@@ -7,7 +7,7 @@
 ;; Maintainer: Bastien Guerry <bzg@gnu.org>
 ;; Keywords: outlines, hypermedia, calendar, wp
 ;; Homepage: https://orgmode.org
-;; Version: 9.3.6
+;; Version: 9.3.7
 ;;
 ;; This file is part of GNU Emacs.
 ;;