Update dependency uvicorn to v0.20.0 (develop)

This MR contains the following updates:

Package	Type	Update	Change
uvicorn (changelog)	dependencies	minor	==0.19.0 -> ==0.20.0

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Release Notes

encode/uvicorn

v0.20.0

Compare Source

Added

• Check if handshake is completed before sending frame on wsproto shutdown (#​1737)
• Add default headers to WebSockets implementations (#​1606 & #​1747) 28/10/22
• Warn user when reload and workers flag are used together (#​1731) 31/10/22

Fixed

• Use correct WebSocket error codes on close (#​1753) 20/11/22
• Send disconnect event on connection lost for wsproto (#​996) 29/10/22
• Add SIGQUIT handler to UvicornWorker (#​1710) 01/11/22
• Fix crash on exist with "--uds" if socket doesn't exist (#​1725) 27/10/22
• Annotate CONFIG_KWARGS in UvicornWorker class (#​1746) 31/10/22

Removed

• Remove conditional on RemoteProtocolError.event_hint on wsproto (#​1486) 31/10/22
• Remove unused handle_no_connect on wsproto implementation (#​1759) 17/11/22

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