ci: update fetch command in workflow to use upstream references

[colinaaa]

Summary

Modified the GitHub Actions workflow to fetch branches from the upstream remote instead of the origin. This change ensures that the correct base branch is used during CI processes, addressing potential issues with branch merging and CI failures.

Fix the failure here.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[changeset-bot]

⚠️ No Changeset found

Latest commit: 68995cc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codspeed-hq]

CodSpeed Performance Report

Merging #584 will not alter performance

_{Comparing colinaaa:main (68995cc) with main (efe6fd7)}

Summary

✅ 1 untouched benchmarks