apply as maintainer (#35424)

Applying as suggested some time ago by techknowlogick.
[List of all merged PRs so
far](https://github.com/go-gitea/gitea/pulls?q=is%3Apr+author%3ATheFox0x7)

Author: TheFox0x7

MAINTAINERS

@@ -63,3 +63,4 @@ hiifong <i@hiif.ong> (@hiifong)
 metiftikci <metiftikci@hotmail.com> (@metiftikci)
 Christopher Homberger <christopher.homberger@web.de> (@ChristopherHX)
 Tobias Balle-Petersen <tobiasbp@gmail.com> (@tobiasbp)
+TheFox <thefox0x7@gmail.com> (@TheFox0x7)