Update GitLab Pages to v0.3.1

What does this MR do?

Update GitLab Pages to 0.3.1 to fix an issue with -metrics-address and daemon mode

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

Why was this MR needed?

Current master and 8.17 are broken

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

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

What are the relevant issue numbers?

enabled an automatic merge when the pipeline for f3f97538 succeeds

merged

Picked into 8-17-stable, will go with 8.17 RC5

removed ~149423 label