Use GitLab Pages v0.4.0

What does this MR do?

Upgrades GitLab Pages from v0.3.2 to v0.4.0

Why was this MR needed?

Bug in Pages v0.3.2 with the -redirect-http flag

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Related to omnibus-gitlab!1348 (merged) gitlab-pages#54 (closed) gitlab-pages!21 (merged)