Update "25.2" defcustom :version's that remain in master

* lisp/ob-clojure.el (org-babel-clojure-sync-nrepl-timeout):
* lisp/org-agenda.el (org-agenda-show-future-repeats):
(org-agenda-prefer-last-repeat):
* lisp/org-bibtex.el (org-bibtex-headline-format-function):
* lisp/ox-publish.el (org-publish-sitemap-sort-folders):
* lisp/ox.el (org-export-global-macros): Change :version from "25.2"
  to "26.1".

As mentioned in 7c710f6f5, it looks like the goal is to sync Org
9.0.* (maint) with the Emacs master branch.  In that case, 26.1 won't
be correct for changes that are specific to Org's master branch, but
neither will 25.2.

lisp/ob-clojure.el

@@ -67,7 +67,7 @@
 If the value is nil, timeout is disabled."
   :group 'org-babel
   :type 'integer
-  :version "25.2"
+  :version "26.1"
   :package-version '(Org . "9.1")
   :safe #'wholenump)
 

lisp/org-agenda.el

@@ -1256,7 +1256,7 @@ When set to the symbol `next' only the first future repeat is shown."
 	  (const :tag "Show all repeated entries" t)
 	  (const :tag "Show next repeated entry" next)
 	  (const :tag "Do not show repeated entries" nil))
-  :version "25.2"
+  :version "26.1"
   :package-version '(Org . "9.1")
   :safe #'symbolp)
 
@@ -1277,7 +1277,7 @@ entries with these TODO keywords."
 	  (const :tag "Prefer base date" nil)
 	  (repeat :tag "Prefer last repeat for entries with these TODO keywords"
 		  (string :tag "TODO keyword")))
-  :version "25.2"
+  :version "26.1"
   :package-version '(Org . "9.1")
   :safe (lambda (x) (or (booleanp x) (consp x))))
 

lisp/org-bibtex.el

@@ -244,7 +244,7 @@ It should take a single argument, the bibtex entry (an alist as
 returned by `org-bibtex-read').  The default value simply returns
 the entry title."
   :group 'org-bibtex
-  :version "25.2"
+  :version "26.1"
   :package-version '(Org . "9.1")
   :type 'function)
 

lisp/ox-publish.el

@@ -335,7 +335,7 @@ This variable is ignored when site-map style is `tree'."
 	  (const :tag "Folders after files" last)
 	  (const :tag "No folder in site-map" ignore)
 	  (const :tag "Mix folders and files" nil))
-  :version "25.2"
+  :version "26.1"
   :package-version '(Org . "9.1")
   :safe #'symbolp)
 

lisp/ox.el

@@ -900,7 +900,7 @@ macro's arguments.  Moreover, if the template starts with
 \"(eval\", it will be parsed as an Elisp expression and evaluated
 accordingly."
   :group 'org-export-general
-  :version "25.2"
+  :version "26.1"
   :package-version '(Org . "9.1")
   :type '(repeat
 	  (cons (string :tag "Name")