nixos/sourcehut: removing myself from maintainers

Sourcehut is too complex, fast moving and RAM hungry for me.
I'll make do with gitolite and public-inbox for now.

nixos/modules/services/misc/sourcehut/default.nix

···
   ];
 
   meta.doc = ./sourcehut.xml;
-  meta.maintainers = with maintainers; [ julm tomberek ];
+  meta.maintainers = with maintainers; [ tomberek ];
 }