www/gitea: Update to 1.18.2

This release fixes a large number of bugs.

PR: 269080
Relnotes: https://blog.gitea.io/2023/01/gitea-1.18.1-is-released/
Relnotes: https://blog.gitea.io/2023/01/gitea-1.18.2-is-released/
(cherry picked from commit 1ed7f6bd95c66f37796305a124b735262bdefb08)