Allow Cython 3 (fix #1083) #505

Job	Run time
test-platforms (3.8, ubuntu-latest, asyncio)	3m 6s
test-postgres (9.5)	3m 25s
test-postgres (9.6)	3m 11s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 12s
test-postgres (10)	2m 48s
test-platforms (3.8, macos-latest, asyncio)	4m 35s
test-postgres (11)	3m 58s
test-postgres (12)	3m 4s
test-platforms (3.8, macos-latest, uvloop)	3m 54s
test-postgres (13)	3m 9s
test-platforms (3.8, windows-latest, asyncio)	6m 46s
test-postgres (14)	3m 59s
test-postgres (15)	3m 32s
test-postgres (16)	3m 8s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 13s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 14s
test-platforms (3.9, macos-latest, asyncio)	4m 26s
test-platforms (3.9, macos-latest, uvloop)	4m 15s
test-platforms (3.9, windows-latest, asyncio)	5m 39s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 44s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 57s
test-platforms (3.10, macos-latest, asyncio)	4m 13s
test-platforms (3.10, macos-latest, uvloop)	4m 4s
test-platforms (3.10, windows-latest, asyncio)	6m 47s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 43s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 49s
test-platforms (3.11, macos-latest, asyncio)	4m 42s
test-platforms (3.11, macos-latest, uvloop)	4m 39s
test-platforms (3.11, windows-latest, asyncio)	5m 59s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 16s
test-platforms (3.12, macos-latest, asyncio)	6m 1s
test-platforms (3.12, windows-latest, asyncio)	6m 21s
Regression Tests	1s
	2h 6m 50s

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