Update publishing pipeline to remove deprcation warning

[andrewphilipsmith]

Recent builds (eg run 12987806735) give depration warning:

build

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

Deprecation notice: v1, v2, and v3 of the artifact actions

The following artifacts were uploaded using a version of actions/upload-artifact that is scheduled for deprecation: "github-pages". Please update your workflow to use v4 of the artifact actions. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

The publishing pipeline needs to be updated to account for these changes.