www/forgejo: Update to 13.0.2

Changelog:
* https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/13.0.2.md

Additional changes:
* Stop setting FORGEJO_WORK_DIR environment variable.  It is already
  hardcoded into the binary, and can be overridden in the configuration
  file if needed.
* Improve the prestart check.

PR:		287010
PR:		289846
MFH:		2025Q4
Reviewed by:	bapt
Differential Revision:	https://reviews.freebsd.org/D53394

(cherry picked from commit ee8bf6e2)