Update codecov.yml to fit latest configure format

[junw-33455432]

[codecov[bot]]

Codecov Report

Base: 77.10% // Head: 77.10% // No change to project coverage :thumbsup:

Coverage data is based on head (eb9c7a6) compared to base (4cdf7df). Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##           g11n-js-client    #1825   +/-   ##
===============================================
  Coverage           77.10%   77.10%           
===============================================
  Files                  20       20           
  Lines                1559     1559           
  Branches              627      627           
===============================================
  Hits                 1202     1202           
  Misses                249      249           
  Partials              108      108           

Flag	Coverage Δ
g11n-js-client	77.10% <ø> (ø)

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