Update workflows to use Node 20

[awharn]

What It Does

Updates workflows to use non-deprecated Node 20 versions

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8aa91ad) 83.83% compared to head (cd8830f) 83.83%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #250   +/-   ##
=======================================
  Coverage   83.83%   83.83%           
=======================================
  Files          34       34           
  Lines        2116     2116           
=======================================
  Hits         1774     1774           
  Misses        342      342           

Flag	Coverage Δ
unittests	83.83% <ø> (ø)

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[t1m0thyj]

Thanks for fixing the artifacts in the Secrets SDK workflow 😋