Testnet op-reth v2.8.1-frax-1.3.4 & op-node v1.20.1-frax-1.2.1

Important

This is a strongly recommended release for all operators, it contains multiple security fixes and bug fixes
More info here and here

This release updates fraxtal-op-reth to v2.8.1-frax-1.3.4 and fraxtal-op-node to v1.20.1-frax-1.2.1.