www/gitea: Update to 1.16.5

• Fixes for runtime issues with go1.18
• Fixes for security issues

Changes: https://github.com/go-gitea/gitea/releases/tag/v1.16.5

PR: 262898, 261576
Reported by: dvl, CTS - FreeBSD Team <de-freebsd@ctseuro.com>
Approved by: maintainer
Security: 83466f76-aefe-11ec-b4b6-d05099c0c059