Trying codecov v4 again

[ldemailly]

for codecov/codecov-action#1284

using fortio/workflows#2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.9%. Comparing base (1a5a8ba) to head (e167d98).

❗ Current head e167d98 differs from pull request most recent head 7fb401a. Consider uploading reports for the commit 7fb401a to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #909     +/-   ##
========================================
+ Coverage    88.8%   89.9%   +1.1%     
========================================
  Files          17      17             
  Lines        5028    4226    -802     
========================================
- Hits         4466    3799    -667     
+ Misses        414     279    -135     
  Partials      148     148             

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