Mark pool-wrapped connection coroutine methods as coroutines #543

Job	Run time	Billable time
test-postgres (9.5)	4m 5s	0s
test-postgres (9.6)	4m 1s	0s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 55s	0s
test-postgres (10)	3m 37s	0s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 55s	0s
test-postgres (11)	3m 44s	0s
test-platforms (3.8, macos-latest, asyncio)	1s	0s
test-postgres (12)	4m 10s	0s
test-platforms (3.8, macos-latest, uvloop)	1s	0s
test-postgres (13)	3m 54s	0s
test-platforms (3.8, windows-latest, asyncio)	2m 48s	0s
test-postgres (14)	3m 38s	0s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 56s	0s
test-postgres (15)	3m 47s	0s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 55s	0s
test-postgres (16)	4m 13s	0s
test-platforms (3.9, macos-latest, asyncio)	1s	0s
test-platforms (3.9, macos-latest, uvloop)	1s	0s
test-platforms (3.9, windows-latest, asyncio)	2m 48s	0s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 55s	0s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 55s	0s
test-platforms (3.10, macos-latest, asyncio)	2m 42s	0s
test-platforms (3.10, macos-latest, uvloop)	2m 39s	0s
test-platforms (3.10, windows-latest, asyncio)	2m 49s	0s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 57s	0s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 56s	0s
test-platforms (3.11, macos-latest, asyncio)	2m 48s	0s
test-platforms (3.11, macos-latest, uvloop)	2m 46s	0s
test-platforms (3.11, windows-latest, asyncio)	2m 53s	0s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 54s	0s
test-platforms (3.12, macos-latest, asyncio)	2m 57s	0s
test-platforms (3.12, windows-latest, asyncio)	2m 48s	0s
Regression Tests	0s	0s
	1h 29m 29s	0s

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