try recognize coverage in CI

[jGaboardi]

This PR:

• is a follow up of h3compat #223 (comment)
• trying to get recognition of true coverer report – 87% locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.2%. Comparing base (b583029) to head (0e98bd9).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##           main    #224      +/-   ##
=======================================
+ Coverage   0.0%   88.2%   +88.2%     
=======================================
  Files        14      14              
  Lines       534     534              
=======================================
+ Hits          0     471     +471     
+ Misses      534      63     -471     

see 14 files with indirect coverage changes