Update Github Actions workflow to v4

Walkthrough

The changes update the GitHub Actions workflow configuration to use newer versions of the checkout and upload-artifact actions and replace an environment variable for better clarity. These modifications ensure continued functionality and improved consistency as older action versions are deprecated.

Changes

Files	Change Summary
`.github/workflows/ci-master.yml`	Updated `ARTIFACT_DIR` to `SOURCE_ARTIFACT_DIR`, changed `actions/checkout` and `actions/upload-artifact` to v4.

Assessment against linked issues

Objective	Addressed	Explanation
Update `actions/upload-artifact` to avoid deprecation (#1459)	✅
Update `actions/checkout` to a newer version (#1459)	✅

Poem

In the world of Actions, we now renew, With checkout and artifact brought up to view. Gone are the old, deprecated ways, Source artifacts now shine in these days. With paths refined and clarity in sight, Our workflows soar, efficient and bright.

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firoorg / firo