chore: bump Nextcloud to 34.0.4; 34.0.3:6 → 34.0.4:0

[helix-nine]

Summary

• Update the official Nextcloud Apache image from 34.0.3 to 34.0.4.
• Publish the package as 34.0.4:0 with localized notes covering the maintenance release's sharing, upload, notification, Photos, and Text fixes.
• Refresh the FileBrowser Quantum package lock to the current next commit; its intervening change is documentation-only.

Upstream verification

• Confirmed 34.0.4-apache is published on Docker Hub with active linux/amd64 and linux/arm64/v8 images.
• Confirmed no 34.0.5-apache image exists and the entrypoint log markers used by install/update progress remain present.
• Full upstream changelog: https://nextcloud.com/changelog/#34-0-4

Testing

• Passed npm run check.
• On an existing 34.0.3 install with users and files, upgrade to 34.0.4:0, start the service, and confirm the update completes, health checks pass, and existing files and apps load; no package was installed or started during this cycle.
• With external storage configured, exercise a public share and file-request upload involving mounted storage, then open Photos and a shared Text document to confirm the highlighted upstream fixes.

Merge with a merge commit — do not squash. next is long-lived: a merge commit leaves it a true ancestor of master, so it fast-forwards cleanly afterwards. A squash re-lands the same content under a new commit, so the branch is left carrying history master will never contain.