[TUTORIAL] update bridging eth with the sdk to use viem

[sbvegan]

Optimism SDK is now in maintenance mode and we want to start sending developers to viem instead since it supports fault proofs. This means all the sdk tutorials will need to revised for viem. This issue if for 1 of 7 SDK tutorials that needs to be rewritten for viem 💟

[sbvegan]

This has been updated here: https://docs.optimism.io/builders/app-developers/tutorials/cross-dom-bridge-eth