Update dependency uvicorn to v0.22.0

This MR contains the following updates:

Package	Type	Update	Change
uvicorn (changelog)	dependencies	minor	0.20.0 -> 0.22.0

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Release Notes

encode/uvicorn

v0.22.0

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Added

• Add --timeout-graceful-shutdown parameter (#​1950) 26/04/23
• Handle SIGBREAK on Windows (#​1909) 15/04/23

Fixed

• Shutdown event is now being triggered on Windows when using hot reload (#​1584) 13/04/23
• --reload-delay is effectively used on the watchfiles reloader (#​1930) 22/04/23

v0.21.1

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Fixed

• Reset lifespan state on each request (#​1903) 16/03/23

v0.21.0

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Added

• Introduce lifespan state (#​1818) 05/03/23
• Allow headers to be sent as iterables on H11 implementation (#​1782) 27/11/22
• Improve discoverability when --port=0 is used (#​1890) 09/03/23

Changed

• Avoid importing h11 and pyyaml when not needed to improve import time (#​1846) 07/02/23
• Replace current native WSGIMiddleware implementation by a2wsgi (#​1825) 16/01/23
• Change default --app-dir from "." (dot) to "" (empty string) (#​1835) 06/01/23

Fixed

• Send code 1012 on shutdown for WebSockets (#​1816) 06/01/23
• Use surrogateescape to encode headers on websockets implementation (#​1005) 12/12/22
• Fix warning message on reload failure (#​1784) 29/11/22

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