Amend actions/upload-artifact to use v4

[davethepunkyone]

Description

The v3 version of actions/upload-artifact is now depreciated and needs to be updated to v4.

Context

The pipeline will now fail because it is no longer supported.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes (where appropriate)
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.