Only Publish Relevant Files, Update GH Actions, Fix Publint Hints

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This PR limits what files are included in the published package to only lib/, examples/, and index.js since those are the files relevant to users.

I also added "type": "commonjs" as it showed up in the publint hints

Finally I also added the newer, missing Node versions to the CI tests, and updated the GH action versions.

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As for other potential improvements, bumping the minimum node version from 6 to 20 (current LTS version) would be okay we could convert the package to ESM (thanks to require(esm)) instead of CJS, and use the native node test runner instead of tap!

fastbench could also be replaced with mitata, a fantastic benchmarking library that helps minimize common issues with benchmarking JS code

There's also neostandard, which is an attempt at a successor for standard

[beeequeue]

@mcollina