Update codecov.yml to fit latest configure format

[junw-33455432]

[codecov[bot]]

Codecov Report

Base: 87.16% // Head: 87.16% // No change to project coverage :thumbsup:

Coverage data is based on head (edf74ea) compared to base (dfa8036). Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##           g11n-go-client    #1828   +/-   ##
===============================================
  Coverage           87.16%   87.16%           
===============================================
  Files                  13       13           
  Lines                 553      553           
===============================================
  Hits                  482      482           
  Misses                 52       52           
  Partials               19       19           

Flag	Coverage Δ
coverage	87.16% <ø> (ø)

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