mediasoup 3.4.9 released

[ibc (Iñaki Baz Castillo)]

• Internals: add Utils::Json::IsPositiveInteger() to not rely on is_number_unsigned() of json lib, which is unreliable due to its design.
• Avoid ES6 export default and always use named export (it does not affect public API).
• router.pipeToRouter(): Ensure a single PipeTransport pair is created between router1 and router2.
  • Since the operation is async, it may happen that two simultaneous calls to router1.pipeToRouter({ producerId: xxx, router: router2 }) would end up generating two pairs of PipeTranports. To prevent that, let’s use an async queue.
• Add keyFrameWaitTime option to ProducerOptions. See:
  • https://mediasoup.org/documentation/v3/scalability/#one-to-many-broadcasting
  • How to forward stream from one mediasoup v3 server to another?
• Update Node and C++ deps.