Upgrade GitLab Pages to v0.7.1

What does this MR do?

Upgrades to a new tiny version of gitlab pages to fix a panic.

0.7.1 is 0.7.0 plus gitlab-pages!70 (merged)

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

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Related to https://gitlab.com/gitlab-com/infrastructure/issues/3848