ci: codecov upload issue

[jobara]

Attempts to work around codecov/codecov-action#1801 by adding a checkout step to the job that uploads the coverage report to CodeCov.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.33%. Comparing base (d5f551e) to head (10ea906).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #137       +/-   ##
=========================================
+ Coverage      0   61.33%   +61.33%     
=========================================
  Files         0        2        +2     
  Lines         0      300      +300     
  Branches      0       33       +33     
=========================================
+ Hits          0      184      +184     
- Misses        0       84       +84     
- Partials      0       32       +32     

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