Update GitHub Actions (bump versions, improve naming a bit) #1895
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What type of PR is this?
What this PR does / why we need it:
This PR updates all GitHub Actions we use to the latest versions. GitHub is phasing out Node.js 16 so actions have to be updated.
I also added the staticcheck linter, enabled. I've been using staticcheck for many years in my personal Go projects and it's a very useful tool. It also works great with golangci-lint.
Which issue(s) this PR fixes:
None
Special notes for your reviewer:
None
Testing
This is a change related itself to testing.
Release Notes
None.