Requires livekit-client >= 2.20.1 for type fixes

Patch Changes

• Require livekit-client >= 2.20.1. That release ships the NonSharedUint8Array - #1360 (@1egoman) type declaration in its published types; earlier 2.19/2.20.0 builds referenced it without shipping it, which broke type resolution for consumers (skipLibCheck: false) and API Extractor. The local workaround shim is removed now that the type resolves from livekit-client itself.