Fix Spotify playback failing on broken Spotify CDN URLs

[marcelveldt]

What does this implement/fix?

Spotify recently started handing some accounts a broken CDN host as the top option (e.g. audio-cf-del-874.spotifycdn.com), which returns HTTP 530. The bundled librespot accepted the first reachable CDN URL and only failed afterwards if it wasn't 206, instead of trying the next URL — so every track failed to load (Unable to load encrypted file: StatusCode(530)) and playback errored with "No playable item found".

This rebuilds the vendored librespot binaries from our fork with the upstream CDN-fallback fix: a CDN URL is now accepted only when it returns 206 Partial Content, otherwise librespot logs a warning and falls back to the next URL.

• Cherry-picked the CDN-fallback fix (upstream librespot PR #1722) onto music-assistant/librespot@mass and rebuilt the binaries.
• Binary update only — no server code changes.

Related issue (if applicable):

• play Spotify Playlist error : No playable item found to playback support#5708
• upstream: Cannot play spotify items using Music Assitant with librespot librespot-org/librespot#1723

Types of changes

• Bugfix (non-breaking change which fixes an issue) — bugfix
• New feature (non-breaking change which adds functionality) — new-feature
• Enhancement to an existing feature — enhancement
• New music/player/metadata/plugin provider — new-provider
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — breaking-change
• Refactor (no behaviour change) — refactor
• Documentation only — documentation
• Maintenance / chore — maintenance
• CI / workflow change — ci
• Dependencies bump — dependencies

Checklist

• The code change is tested and works locally.
• pre-commit run --all-files passes.
• pytest passes, and tests have been added/updated under tests/ where applicable.
• For changes to shared models, the companion PR in music-assistant/models is linked.
• For changes affecting the UI, the companion PR in music-assistant/frontend is linked.
• I have read and complied with the project's AI Policy for any AI-assisted contributions.
• I have raised a PR against the documentation repository targeting the main or beta branch as appropriate.

[Copilot]

Copilot wasn't able to review any files in this pull request.