Set action step outputs via $GITHUB_OUTPUT

[jwodder]

See https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/ for more information.

[codecov]

Codecov Report

Base: 96.61% // Head: 96.61% // No change to project coverage 👍

Coverage data is based on head (0be097a) compared to base (e7a1975).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files          16       16           
  Lines        1623     1623           
=======================================
  Hits         1568     1568           
  Misses         55       55           

Flag	Coverage Δ
unittests	96.61% <ø> (ø)

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[yarikoptic]

Test without network / test (ubuntu-18.04, 3.8) is failing on python -m pip install --upgrade pip wheel. restarting

[yarikoptic]

merging since anyways CI error is unrelated