Update GitHub workflows

[tippmar-nr]

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Description

• Updates various actions referenced in our workflows to use the newer Node v16 compliant versions.
• Replaces deprecated usages of ::set-output with proper usages of GitHub environment files.

Note that I've only been able to test the changes to the following workflow files -- the others either aren't currently used or can't easily be tested due to the work they do (like deploying the agent):

• all_solutions.yml
• repolinter.yml
• run_unit_tests.yml

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)
• Agent Changelog or Lambda Agent changelog updated

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)
• Review Changelog

[codecov-commenter]

Codecov Report

Merging #1422 (c41ead0) into main (8d3af80) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1422   +/-   ##
=======================================
  Coverage   71.61%   71.61%           
=======================================
  Files         459      459           
  Lines       30631    30631           
=======================================
  Hits        21935    21935           
  Misses       8696     8696           

[chynesNR]

It looks fine, but I think we either need to find a way to do some additional testing, or set aside extra time for the next release to make sure there aren't any surprises.

[tippmar-nr]

@chynesNR So, with only a couple of exceptions, the changes in the workflows that I've been unable to test are simple version upgrades that are also mirrored in the workflows that I could test. I would agree that there is some risk with not testing these changes, but I think it's very low. Several of the workflows don't appear to be used at all, a couple are only seldomly used and the others seem to be related to the release process.

I'll be happy to help with (or run) the next release and deal with any issues that might come up, though I'm confident there won't be any.

Thoughts?

[nr-ahemsath]

Since the changes in the workflow files we haven't been able to test are so similar to the changes in the workflows we have been able to test, most importantly the all_solutions_build (main CI), I believe the risk in merging this is acceptable. Approved.

[nr-ahemsath]

Changes look good, verified that the green CI for this PR used the new workflow. 👍