Mark pool-wrapped connection coroutine methods as coroutines #544

Job	Run time	Billable time
test-postgres (9.5)	4m 5s	0s
test-platforms (3.8, ubuntu-latest, asyncio)	3m 36s	0s
test-postgres (9.6)	4m 40s	0s
test-postgres (10)	4m 0s	0s
test-postgres (11)	3m 42s	0s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 22s	0s
test-postgres (12)	3m 54s	0s
test-platforms (3.8, macos-latest, asyncio)	2m 39s	0s
test-postgres (13)	3m 44s	0s
test-platforms (3.8, macos-latest, uvloop)	2m 38s	0s
test-postgres (14)	3m 44s	0s
test-platforms (3.8, windows-latest, asyncio)	5m 14s	0s
test-postgres (15)	3m 43s	0s
test-platforms (3.9, ubuntu-latest, asyncio)	3m 5s	0s
test-platforms (3.9, ubuntu-latest, uvloop)	3m 18s	0s
test-platforms (3.9, macos-latest, asyncio)	2m 47s	0s
test-postgres (16)	3m 32s	0s
test-platforms (3.9, macos-latest, uvloop)	2m 38s	0s
test-platforms (3.9, windows-latest, asyncio)	4m 37s	0s
test-platforms (3.10, ubuntu-latest, asyncio)	3m 9s	0s
test-platforms (3.10, ubuntu-latest, uvloop)	3m 29s	0s
test-platforms (3.10, macos-latest, asyncio)	3m 1s	0s
test-platforms (3.10, macos-latest, uvloop)	2m 39s	0s
test-platforms (3.10, windows-latest, asyncio)	4m 50s	0s
test-platforms (3.11, ubuntu-latest, asyncio)	3m 12s	0s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 15s	0s
test-platforms (3.11, macos-latest, asyncio)	2m 48s	0s
test-platforms (3.11, macos-latest, uvloop)	3m 32s	0s
test-platforms (3.11, windows-latest, asyncio)	5m 1s	0s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 19s	0s
test-platforms (3.12, macos-latest, asyncio)	2m 55s	0s
test-platforms (3.12, windows-latest, asyncio)	5m 31s	0s
Regression Tests	1s	0s
	1h 55m 40s	0s

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