.github: Drop net-dns/bind-tools from automation

Author: krnowak

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

@@ -505,7 +505,6 @@ net-dialup/lrzsz
 net-dialup/minicom
 
 net-dns/bind
-net-dns/bind-tools
 net-dns/c-ares
 net-dns/dnsmasq
 net-dns/libidn2