Use tagName instead of projectVersion

[michael-simons]

GH-Action requires the v. Fixes the readme for the action repository.

[codecov]

Codecov Report

Merging #1183 (76f0254) into main (ba4f82b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1183   +/-   ##
=========================================
  Coverage     59.07%   59.07%           
  Complexity     1052     1052           
=========================================
  Files            84       84           
  Lines          5569     5569           
  Branches        935      935           
=========================================
  Hits           3290     3290           
  Misses         1797     1797           
  Partials        482      482           

Flag	Coverage Δ
Linux	57.90% <ø> (ø)
Windows	57.82% <ø> (ø)

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[maxandersen]

Thanks!