CI/CD workflow doesn't work with Node 20

[mcintyre94]

The CICD workflow started failing when the lts/* node version bumped from 18.x to 20.x: https://github.com/solana-labs/solana-web3.js/actions/runs/6640521649/job/18041101940

This is temporarily resolved by locking the Node version on this workflow to 18.x

This is caused by code in version-from-git that doesn't work on Node 20: compulim/version-from-git#16

version-from-git is unmaintained, with the last commit 4 years ago and a PR fixing this issue open since 31st August

We will need to fork it, or find an updated fork, and use that instead. Then we can bump our CICD workflow to Node 20.

[steveluscher]

We no longer use version-from-git. Problem solved.

[github-actions]

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