www/gitea: Security update 1.26.1 => 1.26.4

While here, fix pkg-plist when BINDATA option is enabled.

Release Notes:
https://blog.gitea.com/release-of-1.26.2
https://blog.gitea.com/release-of-1.26.3-and-1.26.4

PR: 296351
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q2
Security: CVE-2026-27783
Security: CVE-2026-25714
Security: CVE-2026-20706
Security: CVE-2026-27771
Security: CVE-2026-28744
Security: CVE-2026-28699
Security: CVE-2026-26231
Security: CVE-2026-20896
Security: CVE-2026-22874
Security: CVE-2026-27775
Security: CVE-2026-27761
Security: CVE-2026-25038
Security: CVE-2026-24451
Security: CVE-2026-20779
Security: CVE-2026-28740

(cherry picked from commit c553340805b50a2ce1e50a5c50bace3a3de94aaf)