Update GHA to use shared org actions

[penelopeysm]

Closes #803

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.17%. Comparing base (a73dcf2) to head (b6360cd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #805   +/-   ##
=======================================
  Coverage   86.17%   86.17%           
=======================================
  Files          36       36           
  Lines        4305     4305           
=======================================
  Hits         3710     3710           
  Misses        595      595           

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[coveralls]

Pull Request Test Coverage Report for Build 13218558359

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.259%

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Totals
Change from base Build 13161888497:	0.0%
Covered Lines:	3710
Relevant Lines:	4301

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💛 - Coveralls

[penelopeysm]

Unilaterally merging because this is just GHA stuff and I can't test workflow_dispatch ones until it's merged into the default branch