Update license grant years, contributors, and URL to CC0 license

dnstap.proto

@@ -3,7 +3,7 @@
 // This file contains the protobuf schemas for the "dnstap" structured event
 // replication format for DNS software.
 
-// Written in 2013-2014 by Farsight Security, Inc.
+// Written in 2013-2025 by the dnstap contributors.
 //
 // To the extent possible under law, the author(s) have dedicated all
 // copyright and related and neighboring rights to this file to the public
@@ -12,7 +12,7 @@
 // You should have received a copy of the CC0 Public Domain Dedication along
 // with this file. If not, see:
 //
-// <http://creativecommons.org/publicdomain/zero/1.0/>.
+// <https://creativecommons.org/publicdomain/zero/1.0/>.
 
 syntax = "proto2";
 package dnstap;