Deploy swh.vault v1.9

contains:

• to_disk: Represent revisions as empty directories instead of symlinks
• interface: Add download_url method and implement it in backend

Plan:

• Unstuck debian build [1]

staging:

• vault0.staging: Upgrade packages
• vault0.staging: Restart gunicorn-swh-vault
• swh-charts: Merge swh/infra/ci-cd/swh-charts!142 (merged)
• Argocd will deploy ^ (which will restart the cooker workers)
• Checks

production:

• vangogh.azure: Upgrade packages
• vangogh.azure: Restart gunicorn-swh-vault
• workers.azure: Upgrade packages
• workers.azure: Restart swh-worker@vault_cooker service
• swh-charts: Merge staging branch into production & push
• Argocd will deploy
• Checks

[1] https://jenkins.softwareheritage.org/view/swh-debian%20(draft)/job/debian/job/packages/job/DVAU/job/gbp-buildpackage/90/console