(maint) Update labeller.yml to pull_request

[pmcmaw]

Summary

Provide a detailed description of all the changes present in this pull request.

Additional Context

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• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

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Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.80%. Comparing base (82a4f93) to head (a3dcd41).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #114   +/-   ##
=======================================
  Coverage   86.80%   86.80%           
=======================================
  Files          35       35           
  Lines        2092     2092           
=======================================
  Hits         1816     1816           
  Misses        276      276           

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