A bugfix release fixing CI build and publish issues for ARM architect…

…ures.

Fixes go-ethereum eth protocol regression, CI configured to fix C com…

…piler portability

This version includes ETC's Mystique (::London) fork activation numbers

Release v1.12.3

Merges ethereum/go-ethereum/v1.10.8

Fixes vulnerability in EVM return data handling

First of .12 series; includes ethereum/go-ethereum versions 1.10.0-3

Release Candidate #2 on 1.12.0

first release candidate for 1.12 series

Merges ethereum/go-ethereum/v1.9.25