Update node version requirements on Readme

[Pabl0cks]

We just merged #1039 to add yarn ipfs using the new bgipfs package, but Windows users will have problems with SE-2 yarn install if they don't update to >20.18.1.

Changed required version to 20.18.3 on the Readme (closest lts version) so no users have problems with bgipfs package installation.

[rin-st]

Hey Pablo, could you please also update main package.json engines?

[technophile-04]

Thanks Pablo!!

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Ohh I think it would be nice to add the node version check in create-eth too like the CLI will exit directly if it finds the node version is less than our required.

Like the engines field already does that but does not work for everyone as I remember it was not respected for Damu here

[carletex]

Ohh I think it would be nice to add the node version check in create-eth too like the CLI will exit directly if it finds the node version is less than our required.

Yes! We talked about this before: scaffold-eth#162