Update MAINTAINERS (#19896)

Added myself as maintainer
[List of PRs](https://github.com/go-gitea/gitea/pulls?q=is%3Apr+author%3A42wim+is%3Aclosed)

Author: 42wim

MAINTAINERS

@@ -47,3 +47,4 @@ Leon Hofmeister <dev.lh@web.de> (@delvh)
 Gusted <williamzijl7@hotmail.com) (@Gusted)
 singuliere <singuliere@autistici.org> (@singuliere)
 silentcode <silentcode@senga.org> (@silentcodeg)
+Wim <wim@42.be> (@42wim)