Replace NETCOREAPP3_1_OR_GREATER with new NET

[snakefoot]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.58%. Comparing base (dfff5da) to head (fdcdb6c).
⚠️ Report is 9 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #828      +/-   ##
==========================================
- Coverage   71.81%   71.58%   -0.24%     
==========================================
  Files          23       23              
  Lines        2168     2168              
  Branches      435      435              
==========================================
- Hits         1557     1552       -5     
- Misses        430      435       +5     
  Partials      181      181              

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