Update actions/checkout 2->3+

[qqmyers]

What this PR does / why we need it: I'm seeing warnings that actions/checkout 2 uses the deprecated node 12 and an update to at least v3 using node 16 is needed. There is a v4 (node 20), and, in looking through the code, I see several other v3 actions that have v4 versions.

This PR updates all of these to v4.

Which issue(s) this PR closes:

• Closes #

Special notes for your reviewer:

Suggestions on how to test this: Guessing this is like the earlier #10997 PR in that we're just looking to make sure things don't break. If they do, we can either address the issue or roll-back the relevant change. (The shift from checkout v2 is one we should keep so we stop using node 12, but everything else is ~optional.)

The changes are across many tasks - building the guides, review dog, pushing containers, pushing the spi, etc.

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

Additional documentation:

[pdurbin]

This PR from @carlsonp might help us know when to bump versions in the GitHub Actions we use:

• add check to look for updates to Github actions being used #9251

[pdurbin]

Seems fine. Approved. Sadly, we have no way to test this so let's revert if anything breaks.

Also, as @qqmyers notes, we should close the open PRs (after we merge this and confirm nothing is broken?) created by dependabot that have the same fixes (#11100 etc.) at some point.

[ofahimIQSS]

Performed short round of regression testing in internal - no issues uncovered.

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