bump audio version to v8 from v4

[braindigitalis]

Bumps audio websocket protocol from v4 to v8. Required going forward from November 18th.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[braindigitalis]

Unit tests pass, no further adjustment is required at this time beyond our already existing support for XChaCha20.