BIT-LIBPYTHON-2024-12254 Unbounded memory buffering in SelectorSocketTransport.writelines()

Starting in Python 3.12.0, the asyncio.SelectorSocketTransport.writelines method would not "pause" writing and signal to the Protocol to drain the buffer to the wire once the write buffer reached the "high-water mark". Because of this, Protocols would not periodically drain the write buffer...