minor improvements and fixes for release workflow

[GuyAv46]

1. ::set-output is deprecated. Changing to the new syntax.
2. simplified step
3. addressing github.ref is empty for workflows triggered by release actions/runner#2788
4. typo fix on input for snok/install-poetry

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3671409) 34.05% compared to head (69e7ab4) 34.05%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   34.05%   34.05%           
=======================================
  Files          17       17           
  Lines        2393     2393           
=======================================
  Hits          815      815           
  Misses       1578     1578           

Flag	Coverage Δ
unittests	34.05% <ø> (ø)

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