chore: Upgrade upload-artifact to v4

[YueyingLu]

Description

Upgrade upload-artifact to v4 because https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.45%. Comparing base (7468aa5) to head (d860ec9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
+ Coverage   93.59%   95.45%   +1.85%     
==========================================
  Files          61       61              
  Lines        4312     4312              
  Branches      525      664     +139     
==========================================
+ Hits         4036     4116      +80     
+ Misses        276      196      -80     

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[YueyingLu]

The Visual Regression action failed on

Downloading snapshots created in run 12951677516
no valid artifacts found to download

because the run 12951677516 failed in the recent rerun in upload artifact step https://github.com/cloudscape-design/board-components/actions/runs/12951677516 so the artifact does not exist.

But the upload should actually work, proof is that the screenshot was updated in previous run in this PR https://github.com/cloudscape-design/board-components/actions/runs/13332149965