Update tests.yml

[myrmarachne]

Updated artifact actions to use v4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.01%. Comparing base (f56a2d7) to head (bffaff4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #195      +/-   ##
==========================================
+ Coverage   76.91%   77.01%   +0.09%     
==========================================
  Files         228      228              
  Lines        9226     9226              
==========================================
+ Hits         7096     7105       +9     
+ Misses       2130     2121       -9     

see 1 file with indirect coverage changes

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