[heroes] IPv6 range has changed for the Nuremberg machines

Hello, just a heads up, we got new IPv6 range from MF-IT for the Nuremberg machines, so darix and I updated the ipv6 addresses for all of those machines. While we changed the addresses on DNS, we let both the old and the new address on the machines themselves to minimize DNS propagation issues. We plan to remove them on Friday morning. Please let me know if anything is wrong. Theo