workflows: Update to latest actions/setup-go

[dbussink]

We were using v3 and v2 in places. v2 throws a deprecation warning for node.js. So let's update this in general across the board to the latest released version.

Marked this for backporting to v15 and v16 as well since https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/ talks about summer 2023 and rather not get hit then with something breaking if we need to release a patch for still supported versions.

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on the CI
• Documentation was added or is not required

[vitess-bot]

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[vitess-bot]

I was unable to backport this Pull Request to the following branches: release-15.0, release-16.0.