chore: node 20 as default runtime

[crazy-max]

Node 16 reaches the end of life on Sep, 11 2023. Node 20 is supported on GitHub Runners since https://github.com/actions/runner/releases/tag/v2.308.0.

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Codecov Report

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[crazy-max]

@caarlos0 Looks like we have an issue with nightly releases: https://github.com/goreleaser/goreleaser-action/actions/runs/6132162449/job/16642788626?pr=432#step:4:8

Seems to happen for a couple of days:

[dirien]

This PR is confusing, as you update yarn and the runtime to node20. Is this linked to each other?

[crazy-max]

This PR is confusing, as you update yarn and the runtime to node20. Is this linked to each other?

There are separate commits in my history so it's easy to relate each change but merge policy of goreleaser enforces squash :man_shrugging::

And no, yarn update not necessary. I just took the opportunity to do it as I needed to update dev deps.