www/owncast: update to 0.0.10

Changelog:

• https://github.com/owncast/owncast/releases/tag/v0.0.8
• https://github.com/owncast/owncast/releases/tag/v0.0.9
• https://github.com/owncast/owncast/releases/tag/v0.0.10

PR: 259934
Approved by: de-freebsd@ctseuro.com (maintainer timeout, >3 weeks)