chore: changes the CLA action trigger to pull_request_target

[cmbengue]

Purpose

This PR updates the CLA Actions workflow trigger from pull_request to pull_request_target.

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• I have read and checked the items on the review checklist.

[cmbengue-ec-intl]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.26%. Comparing base (ec4d429) to head (bfe6a0a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #398      +/-   ##
==========================================
+ Coverage   94.20%   94.26%   +0.05%     
==========================================
  Files          10       10              
  Lines        1813     1813              
==========================================
+ Hits         1708     1709       +1     
+ Misses        105      104       -1     

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