Optimism Recommends op-node v1.19.8 For Sequencers Ahead Of Glamsterdam

TL;DR Optimism has released op-node v1.19.8 and recommends it particularly for sequencer operators using `–l2.follow.source`. The release fixes recurring slow block builds around L1-origin transitions and strengthens validation of hardfork activation ordering. Sepolia OP Stack operators must be on op-node v1.19.5 or later before the October 6 Glamsterdam hardfork. Optimism has shipped a focu