Update customize-package-emacs-version-alist

* lisp/org.el (customize-package-emacs-version-alist): Add entries for
all existing ":package-version" values, and remove entries for
versions that aren't used as ":package-version" values.

Note that this alist has a limited effect because we specify
":version" in almost all of our defcustoms.  Two functions make use of
this alist: describe-variable-custom-version-info and
customize-changed-options.  The former only looks at the alist if
:version isn't specified, and the latter only looks at :version if an
entry for :package-version isn't found in the alist.

We should consider removing the defcustom :version specifications so
that the package-version->version mapping only needs to be maintained
in one place.

lisp/org.el

@@ -5552,10 +5552,13 @@ The following commands are available:
 
 ;; Update `customize-package-emacs-version-alist'
 (add-to-list 'customize-package-emacs-version-alist
-	     '(Org ("6.21b" . "23.1")  ("6.33x" . "23.2")
-		   ("7.8.11" . "24.1") ("7.9.4" . "24.3")
-		   ("8.2.6" . "24.4") ("8.2.10" . "24.5")
-		   ("9.0" . "26.1")))
+	     '(Org ("8.0" . "24.4")
+		   ("8.1" . "24.4")
+		   ("8.2" . "24.4")
+		   ("8.2.7" . "24.4")
+		   ("8.3" . "26.1")
+		   ("9.0" . "26.1")
+		   ("9.1" . "26.1")))
 
 (defvar org-mode-transpose-word-syntax-table
   (let ((st (make-syntax-table text-mode-syntax-table)))