[ci] Simplify checkout of submodules

[ricab]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.53%. Comparing base (896fcb7) to head (dc42588).
Report is 3393 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4038   +/-   ##
=======================================
  Coverage   89.53%   89.53%           
=======================================
  Files         260      260           
  Lines       14741    14741           
=======================================
  Hits        13198    13198           
  Misses       1543     1543           

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