Update MAINTAINERS (#33529)

* Add myself to the maintainers file

Author: ChristopherHX

MAINTAINERS

@@ -63,3 +63,4 @@ Kemal Zebari <kemalzebra@gmail.com> (@kemzeb)
 Rowan Bohde <rowan.bohde@gmail.com> (@bohde)
 hiifong <i@hiif.ong> (@hiifong)
 metiftikci <metiftikci@hotmail.com> (@metiftikci)
+Christopher Homberger <christopher.homberger@web.de> (@ChristopherHX)