org-layer: Update to org 9.6.1, fixing broken install

This integrates the patch that fix default install:
https://list.orgmode.org/87bkonzisl.fsf@gnu.org/T/#u

In particular fixes the error:
(invalid-function org-assert-version)

layers/+emacs/org/packages.el

@@ -33,7 +33,7 @@
     htmlize
     ;; ob, org, org-agenda and org-contacts are installed by `org-contrib'
     (ob :location built-in)
-    (org :location elpa :min-version "9.6")
+    (org :location elpa :min-version "9.6.1")
     (org-agenda :location built-in)
     (org-wild-notifier
                 :toggle org-enable-notifications)