www/forgejo7: Update 7.0.4 → 7.0.8

Branch 7.0.x is a kind of LTS - supported until July of 2025:
https://forgejo.org/2024-07-release-v8-0/#release-schedule-and-long-term-support

Changelogs:
https://codeberg.org/forgejo/forgejo/src/branch/forgejo/RELEASE-NOTES.md#7-0-5
https://codeberg.org/forgejo/forgejo/src/branch/forgejo/RELEASE-NOTES.md#7-0-6
https://codeberg.org/forgejo/forgejo/milestone/7683
https://codeberg.org/forgejo/forgejo/milestone/7729

• Take maintainership.
• Add CONFLICTS_INSTALL with www/forgejo.

PR: 280532