Add me to maintainers (#22998)

Add me to maintainers.

[List of merged
PRs](https://github.com/go-gitea/gitea/pulls?q=is%3Apr+author%3AZettat123+is%3Amerged)

Co-authored-by: Jason Song <i@wolfogre.com>

Author: Zettat123

MAINTAINERS

@@ -47,3 +47,4 @@ Wim <wim@42.be> (@42wim)
 Xinyu Zhou <i@sourcehut.net> (@xin-u)
 Jason Song <i@wolfogre.com> (@wolfogre)
 Yarden Shoham <hrsi88@gmail.com> (@yardenshoham)
+Yu Tian <zettat123@gmail.com> (@Zettat123)