Upgrade two more download-artifact v3 actions to v4 in Firestore workflow

[DellaBitta]

Discussion

There were a pair of download-artifact GitHub actions that were still set to v3 instead of v4. The v3 actions were unable to find the build archive in the test-changed-firestore workflow. This PR upgrades those to v4 actions.

For an example of this failure, check this CI run.

Testing

CI.

API Changes

N/A.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5344133

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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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (0755a72) and merge commit (e063ac4).

Test Logs

• Base (0755a72): https://github.com/firebase/firebase-js-sdk/actions/runs/12717073983
• Merge (e063ac4): https://github.com/firebase/firebase-js-sdk/actions/runs/12776162858

1. https://storage.googleapis.com/firebase-sdk-metric-reports/lGgS0k9BB8.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (0755a72) and merge commit (e063ac4).

Test Logs

• Base (0755a72): https://github.com/firebase/firebase-js-sdk/actions/runs/12717073983
• Merge (e063ac4): https://github.com/firebase/firebase-js-sdk/actions/runs/12776162858

1. https://storage.googleapis.com/firebase-sdk-metric-reports/c2r2iSD4j2.html

[hsubox76]

I guess it wasn't caught by the Renovate PR #8128 because that PR was originally created in April and last updated in May, and Daniel added these jobs in October?