Changed node version from LTS to v18.18.0

[kbennett2000]

Changed node version from LTS to v18.18.0 to be compatible with dapp-agoric-basics

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[dckc]

some background is in pull/1065#issuecomment-2064205551

[dckc]

I gather this is a work-around for:

• https://github.com/Agoric/dapp-agoric-basics/issues/35