.github: Add sys-apps/selinux-python to automation

Author: krnowak

.github/workflows/portage-stable-packages-list

@@ -658,6 +658,7 @@ sys-apps/portage
 sys-apps/pv
 sys-apps/sandbox
 sys-apps/sed
+sys-apps/selinux-python
 sys-apps/semodule-utils
 sys-apps/shadow
 sys-apps/smartmontools