dns-root-data: the old KSK is dead!

Long live... eh, I hope the new KSK won't live as long as the old one.
Anyway, it doesn't really matter how fast people update this.
https://www.ietf.org/mail-archive/web/dnsop/current/msg24989.html
See RFC 5011 for details of the protocol.

I re-tested validation with both of these files, to be sure.