fix: Ensure GitHub Copilot can bypass the CLA workflow

[alessfg]

Proposed changes

See title.

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• I have read the contributing guidelines.
• I have signed the F5 Contributor License Agreement (CLA).
• If applicable, I have added tests that prove my fix is effective or that my feature works.
• If applicable, I have checked that any relevant tests pass after adding my changes.
• I have updated any relevant documentation (README.md and CHANGELOG.md).

[TasoOneAsia]

I see that the GItHub UI displays the copilot username as copilot (AI), similar to how dependabot (bot) is displayed.

Is the username not copilot[ai]?

[alessfg]

Based on nginx/docker-nginx-unprivileged#342 (comment), I think the username is copilot