www/forgejo: Update to 13.0.1 and assume maintainership

Changelog:

• https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/13.0.0.md
• https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/13.0.1.md

Reviewed by: arrowd, bapt
Differential Revision: https://reviews.freebsd.org/D53297

(cherry picked from commit f0fec200720c337dc354d2ee17b5927bac74eb53)