docs: add martinezeguiluz as a contributor for code

[allcontributors[bot]]

Adds @martinezeguiluz as a contributor for code.

This was requested by handwerkerd in this comment

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.54%. Comparing base (670796b) to head (8a8484f). Report is 49 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1032 +/- ## ======================================= Coverage 89.54% 89.54% ======================================= Files 26 26 Lines 3462 3462 Branches 632 632 ======================================= Hits 3100 3100 Misses 210 210 Partials 152 152 ```

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