www/gitea: Update to 1.20.1 (fixes security vulnerabilities)

This release contains one security fix, and a number of enhancements and
bug fixes. See the release notes for details.

Release notes:

• https://blog.gitea.com/release-of-1.20.1
• https://github.com/go-gitea/gitea/releases/tag/v1.20.1

PR: 272672
MFH: 2023Q3
Security: ab0bab3c-2927-11ee-8608-07b8d3947721
(cherry picked from commit 1fb3b760fc16c65ae5edf290ef73c5d502621494)