Update dependency uvicorn to ^0.28.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
uvicorn (changelog)	^0.27.0 -> ^0.28.0

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Release Notes

encode/uvicorn (uvicorn)

v0.28.0

Compare Source

Added

• Raise ClientDisconnected on send() when client disconnected (#​2220) 12/02/24

Fixed

• Except AttributeError on sys.stdin.fileno() for Windows IIS10 (#​1947) 29/02/24
• Use X-Forwarded-Proto for WebSockets scheme when the proxy provides it (#​2258) 01/03/24

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