Use GitLab Pages v0.4.1

Nick Thomas requested to merge (removed):pages-0.4.1 into master

What does this MR do?

Switches to GitLab Pages v0.4.1, fixing a long-standing bug for projects with multiple custom domains

Are there points in the code the reviewer needs to double check?

The only change in Pages is

Why was this MR needed?

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

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