snapcast: update to v0.34.0

snapcast: update to v0.34.0

A straightforward update from 0.28.0 (2024-03-19, [1])
to 0.34.0 (2025-10-12, [2]) with almost 400 commits. [3]

Notable change is the configurable OpenSSL support (BUILD_WITH_SSL)
for both snapserver and snapclient.
They will be enabled once I introduce the flavours.

In the mean time upsteam moved to it's own organization. [4]

Upstream changelog:
https://github.com/snapcast/snapcast/blob/v0.34.0/changelog.md

[1]: https://github.com/snapcast/snapcast/releases/tag/v0.28.0
[2]: https://github.com/snapcast/snapcast/releases/tag/v0.34.0
[3]: https://github.com/snapcast/snapcast/compare/v0.28.0...v0.34.0
[4]: https://github.com/snapcast

Signed-off-by: Szabolcs Hubai <redacted>