Update actions/upload-artifact action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/upload-artifact	action	major	v3 -> v4

Test URLs:

• Original: https://www.sunstar.com
• Before: https://main--sunstar--hlxsites.hlx.live
• After: https://renovate-actions-upload-artifact-4-x--sunstar--hlxsites.hlx.live

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Release Notes

actions/upload-artifact (actions/upload-artifact)

v4

Compare Source

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