www/gitea: Update to 1.19.3

Fixes CVE-2023-24539, CVE-2023-24540, and CVE-2023-29400.

ChangeLog: https://blog.gitea.io/2023/05/gitea-1.19.3-is-released/

PR: 271739
Approved by: Stefan Bethke <stb@lassitu.de> (maintainer)

(cherry picked from commit 3ae388d9fbd38ca705656ffce57ab4dad48060c4)