vpcs: remove myself as maintainer

I've stopped using GNS3.

pkgs/applications/virtualization/vpcs/default.nix

···
     inherit (src.meta) homepage;
     license = licenses.bsd2;
     platforms = platforms.linux;
-    maintainers = with maintainers; [ primeos ];
+    maintainers = with maintainers; [ ];
   };
 }