Update dependency uvicorn to v0.30.4

This MR contains the following updates:

Package	Update	Change
uvicorn (changelog)	patch	==0.30.1 -> ==0.30.4

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Release Notes

encode/uvicorn (uvicorn)

v0.30.4

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Fixed

• Close connection when h11 sets client state to MUST_CLOSE (#​2375)

v0.30.3

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Fixed

• Suppress KeyboardInterrupt from CLI and programmatic usage (#​2384)
• ClientDisconnect inherits from OSError instead of IOError (#​2393)

v0.30.2

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Added

• Add reason support to websocket.disconnect event (#​2324)

Fixed

• Iterate subprocesses in-place on the process manager (#​2373)

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