For the 0.22 release we'll want to start hardcoding Torv3 addresses instead of (or in addition to) Torv2.

The biggest challenge here is not how to hardcode them, although that will require a few minor script and code changes, but how to collect them. The release process is to get the addresses from DNS seeders, however these currently don't support the `addrv2` message nor Torv3 addresses in the first place. Nor do they really have a need to.
#ifndef BITCOIN_CHAINPARAMSSEEDS_H
#define BITCOIN_CHAINPARAMSSEEDS_H
/**
 * List of fixed seed nodes for the bitcoin network
 * AUTOGENERATED by contrib/seeds/generate-seeds.py
 *
 * Each line contains a 16-byte IPv6 address and a port.
 * IPv4 as well as onion addresses are wrapped inside an IPv6 address accordingly.
 */
static SeedSpec6 pnSeed6_main[] = {
    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x02,0x27,0xad,0x7e}, 8333},
    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x03,0x0e,0xa8,0xc9}, 48333},
    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x04,0x24,0x70,0x2c}, 8333},
    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x05,0x08,0x12,0x1f}, 8333},
    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x05,0x0e,0xc8,0xa7}, 8333},
    {{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x05,0x38,0x14,0x02}, 8333},