Restore org-journal to use the upstream package

[lhernanz]

Emacs 29.4
Head of Spacemacs develop branch

Some calendar related functions (e.g. org-deadilne) are failing with org-9.7 as org-journal is creating an entry in a calendar hook that calls the method org-journal--with-journal. This method creates a buffer in fundamental mode with org contents that are parsed with the org-element api, generating a warning that makes the invocation to fail.

Long story short, Spacemacs is using a 3y old fork of org-journal that has not seen any updates since. Meanwhile upstream seems to be back to life after a period of low activity and they have fixed this particular bug and some others.

Although it does not seem that the changes that started the fork have been merged upstream, it seems that moving back to, better supported, upstream would be a wise move for Spacemance. If these changes are needed, upstream might be more willing to accept it that it was 3y ago.

Alternatively, I guess that @dalanicolai could update his fork with the latest changes from upstream so that he can preserve his changes.