docs: add martaarbizu as a contributor for code

[allcontributors]

Adds @martaarbizu as a contributor for code.

This was requested by handwerkerd in this comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.55%. Comparing base (0d66342) to head (d2b8948).
Report is 44 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1039   +/-   ##
=======================================
  Coverage   89.55%   89.55%           
=======================================
  Files          26       26           
  Lines        3466     3466           
  Branches      634      634           
=======================================
  Hits         3104     3104           
  Misses        210      210           
  Partials      152      152           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.