editors/emacs: Update to 29.2

This is a bug-fix release with no new features.

Changelog: https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-29.2
Reviewed by: ashish
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D43616

(cherry picked from commit 29b94c52385d864db8ced05dfd327aae4e432919)