The grant funds will be used for further performance improvements and continued maintenance of the library.

Feature-wise, this includes:
* Implementing the ACK_FREQUENCY extension (https://github.com/quic-go/quic-go/issues/2482). We expect significant speedups of high-bandwidth transfers.
* Implementing BBRv3: A new congestion controller, improving performance by reducing queueing delays (https://github.com/quic-go/quic-go/issues/4565).