Update customize-package-emacs-version-alist

* lisp/org.el (customize-package-emacs-version-alist): Map Org 9.4 to
Emacs 27.2.

9.4.x, rather than 9.3.8, may be synced for the upcoming Emacs 27.2
release (bug#43268, <87lfeo3vzg.fsf@bzg.fr>).

lisp/org.el

@@ -4924,7 +4924,7 @@ The following commands are available:
 		   ("9.1" . "26.1")
 		   ("9.2" . "27.1")
 		   ("9.3" . "27.1")
-		   ("9.4" . "28.1")))
+		   ("9.4" . "27.2")))
 
 (defvar org-mode-transpose-word-syntax-table
   (let ((st (make-syntax-table text-mode-syntax-table)))