Apply to become a maintainer (#30151)

PRs:https://github.com/go-gitea/gitea/pulls?q=is%3Apr+author%3AHEREYUA+is%3Aclosed

Discord: hereyua

MAINTAINERS

@@ -60,3 +60,4 @@ Nanguan Lin <nanguanlin6@gmail.com> (@lng2020)
 kerwin612 <kerwin612@qq.com> (@kerwin612)
 Gary Wang <git@blumia.net> (@BLumia)
 Tim-Niclas Oelschläger <zokki.softwareschmiede@gmail.com> (@zokkis)
+Yu Liu <1240335630@qq.com> (@HEREYUA)