net-p2p/go-ethereum: upgrade to 1.12.2

ChangeLog: https://github.com/ethereum/go-ethereum/releases/tag/v1.12.2

For version 1.12.1, the main change is preparing for the Cancun fork.
Version 1.12.2 is mainly a maintenance release with small bugfixes.
(https://github.com/ethereum/go-ethereum/releases/tag/v1.12.2)

PR: 273135
Reported by: me@enriquefynn.com (maintainer)