Lighthouse v7 IPv6 auto-ENR

[yorickdowne]

What I did

Rely on auto-ENR for Lighthouse v7. This requires observation that post-Pectra, the default IPv6 in Lighthouse actually causes auto ENR to work

[yorickdowne]

We have critical mass

consensus-1  | Jan 23 20:47:25.092 INFO  Deposit contract                              deploy_block: 11184524, address: 0x00000000219ab540356cbb839cbe05303d7705fa
consensus-1  | Jan 23 20:47:52.203 INFO  Listening established                         address: /ip4/0.0.0.0/tcp/9003/p2p/16Uiu2HAmJ8t9BZCJBwefNzUPtmdxhHgwdcdn8EjnFFh1Fu2u12Dw
consensus-1  | Jan 23 20:47:52.204 INFO  Listening established                         address: /ip4/0.0.0.0/udp/9004/quic-v1/p2p/16Uiu2HAmJ8t9BZCJBwefNzUPtmdxhHgwdcdn8EjnFFh1Fu2u12Dw
consensus-1  | Jan 23 20:47:52.204 INFO  Listening established                         address: /ip6/::/udp/9004/quic-v1/p2p/16Uiu2HAmJ8t9BZCJBwefNzUPtmdxhHgwdcdn8EjnFFh1Fu2u12Dw
consensus-1  | Jan 23 20:47:52.204 INFO  Listening established                         address: /ip6/::/tcp/9003/p2p/16Uiu2HAmJ8t9BZCJBwefNzUPtmdxhHgwdcdn8EjnFFh1Fu2u12Dw
consensus-1  | Jan 23 20:47:52.208 INFO  HTTP API started                              listen_address: 0.0.0.0:5052
consensus-1  | Jan 23 20:47:52.208 INFO  Metrics HTTP server started                   listen_address: "0.0.0.0:8008"
consensus-1  | Jan 23 20:47:52.521 INFO  Address updated                               ip: 152.53.47.180, udp_port: 9003
consensus-1  | Jan 23 20:48:16.272 INFO  Address updated                               ip: 2a0a:4cc0:0:201c:a898:e7ff:fe2c:8566, udp_port: 9003