Update GitHub Artifact Actions to v4 (major)

[renovate[bot]]

This PR contains the following updates:

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

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Release Notes

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

### [`v4`](https://togithub.com/actions/download-artifact/compare/v3...v4) [Compare Source](https://togithub.com/actions/download-artifact/compare/v3...v4)

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

### [`v4`](https://togithub.com/actions/upload-artifact/compare/v3...v4) [Compare Source](https://togithub.com/actions/upload-artifact/compare/v3...v4)

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Configuration

📅 Schedule: Branch creation - "before 3am on Monday" (UTC), 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 these updates again.

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

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This PR has been generated by Mend Renovate. View repository job log here.

[cypress[bot]]

Passing run #4614 ↗︎

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Details:

Update GitHub Artifact Actions to v4
Project: NotGovUK	Commit: f417fc31e2
Status: Passed	Duration: 12:08 💡
Started: Feb 26, 2024 12:45 AM	Ended: Feb 26, 2024 12:57 AM

Review all test suite changes for PR #918 ↗︎

[cypress[bot]]

Passing run #4616 ↗︎

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Details:

Merge f417fc31e222ec6179358550958168b6146dc86c into ed84b26e0e90f9de8f4f84096dc2...
Project: NotGovUK	Commit: f2a16e48e1 ℹ️
Status: Passed	Duration: 13:04 💡
Started: Feb 26, 2024 12:45 AM	Ended: Feb 26, 2024 12:59 AM

Review all test suite changes for PR #918 ↗︎