Update airplay-cli to v0.5.3 (#6071)

# What does this implement/fix?

Updates the server Dockerfile to use the verified
[airplay-cli v0.5.3
release](https://github.com/music-assistant/airplay-cli/releases/tag/v0.5.3).

- Pins `CLIAIRPLAY_VERSION` to `v0.5.3`.
- Pins `CLIAIRPLAY_CHECKSUMS_SHA256` to
`fdbc76b0ac9fe0020ddcc5939cd62e4af5e7d78422337fecbaf912d9ff0131b0`.
- The release workflow verified the four published binaries and
`SHA256SUMS` before opening this PR.

**Related issue (if applicable):**

- N/A

## 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`
- [x] Dependencies bump — `dependencies`

## Checklist

- [ ] The code change is tested and works locally. (Release assets and
pin updates were verified in CI; no local server build is run.)
- [ ] `pre-commit run --all-files` passes. (Not run by this pin-only
automation.)
- [ ] `pytest` passes, and tests have been added/updated under `tests/`
where applicable. (Not applicable to a Dockerfile pin-only change.)
- [ ] For changes to shared models, the companion PR in
`music-assistant/models` is linked. (Not applicable.)
- [ ] For changes affecting the UI, the companion PR in
`music-assistant/frontend` is linked. (Not applicable.)
- [ ] I have read and complied with the project's [AI
Policy](https://github.com/music-assistant/.github/blob/main/AI_POLICY.md)
for any AI-assisted contributions. (Not applicable to this automated
pin-only PR.)
- [ ] I have raised a PR against the documentation repository targeting
the main or beta branch as appropriate. (Not applicable.)

Co-authored-by: musicassistant-bot[bot] <304008617+musicassistant-bot[bot]@users.noreply.github.com>