ci: fix locale extraction job

[willdurand]

Fixes mozilla/addons#15841

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (b392f89) to head (74468af).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #13804   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files         265      265           
  Lines       10661    10661           
  Branches     3271     3271           
=======================================
  Hits        10478    10478           
  Misses        170      170           
  Partials       13       13           

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