Update actions/download-artifact action to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/download-artifact	action	major	v7 → v8

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Release Notes

actions/download-artifact (actions/download-artifact)

v8

Compare Source

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Configuration

📅 Schedule: (UTC)

• Branch creation
  • Between 12:00 AM and 03:59 AM, only on Monday (* 0-3 * * 1)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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