fix(deps): update rust crate tungstenite to 0.20.0

[vanlueckn]

This PR contains the following updates:

Package	Type	Update	Change
tungstenite	dependencies	minor	0.19.0 -> 0.20.0

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Release Notes

snapview/tungstenite-rs (tungstenite)

v0.20.0

Compare Source

• Remove many implicit flushing behaviours. In general reading and writing messages will no
  longer flush until calling flush. An exception is automatic responses (e.g. pongs)
  which will continue to be written and flushed when reading and writing.
  This allows writing a batch of messages and flushing once, improving performance.
• Add WebSocket::read, write, send, flush. Deprecate read_message, write_message, write_pending.
• Add FrameSocket::read, write, send, flush. Remove read_frame, write_frame, write_pending.
  Note: Previous use of write_frame may be replaced with send.
• Add WebSocketContext::read, write, flush. Remove read_message, write_message, write_pending.
  Note: Previous use of write_message may be replaced with write + flush.
• Remove send_queue, replaced with using the frame write buffer to achieve similar results.
  • Add WebSocketConfig::max_write_buffer_size. Deprecate max_send_queue.
  • Add Error::WriteBufferFull. Remove Error::SendQueueFull.
    Note: WriteBufferFull returns the message that could not be written as a Message::Frame.
• Add ability to buffer multiple writes before writing to the underlying stream, controlled by
  WebSocketConfig::write_buffer_size (default 128 KiB). Improves batch message write performance.
• Panic on receiving invalid WebSocketConfig.

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