Updated upload & download artifact to v4

[nicheexpress]

enhance: Updated test-all workflow to the latest version of upload/download artifact as if offers 90% faster upload/download time

[changeset-bot[bot]]

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Latest commit: a0ee22f8d82298398c87aa335239a2567a042305

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[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[hsubox76]

Thanks! Two comments: (1) You'll need to sign the CLA to contribute (follow the instructions in the "google-cla" comment above) (2) We probably don't want to pin it narrowly to a specific version (probably actions/upload-artifact@v4 is good enough - that way we can get minor updates without changing the workflow)

[nicheexpress]

Thanks! Signed the CLA & updated the PR per the review request