selinux-python: add myself as maintainer

pkgs/os-specific/linux/selinux-python/default.nix

···
     description = "SELinux policy core utilities written in Python";
     license = licenses.gpl2Plus;
     homepage = "https://selinuxproject.org";
+    maintainers = with lib.maintainers; [ RossComputerGuy ];
     platforms = platforms.linux;
   };
 }