Mark 3.7.7 (#2747)

# 3.7.7 / 2025-04-14

**General**

- Added ability to denylist/blacklist email domains from registering
- Hints can now include an optional title that is shown to users before unlocking

**Admin Panel**

- Challenge files now show the stored sha1sum

**Deployment**

- Fixed issue where the `/api/v1/scoreboard/top/<count>` endpoint wouldn't cache different count values properly
- The `/api/v1/scoreboard/top/<count>`endpoint will now return at most the top 50 accounts
- Updated gunicorn to 23.0.0
- Updated Jinja2 to 3.1.6