Update dependency uvicorn to v0.18.3 (develop)

This MR contains the following updates:

Package	Type	Update	Change
uvicorn (changelog)	dependencies	patch	==0.18.2 -> ==0.18.3

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Release Notes

encode/uvicorn

v0.18.3

Compare Source

Fixed

• Remove cyclic references on HTTP implementations. (#​1604) 24/08/22

Changed

• reload_delay default changed from None to 0.25 on uvicorn.run() and Config. None is not an acceptable value anymore. (#​1545) 02/07/22

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