Implement GSSAPI authentication #526

Job	Run time	Billable time
test-postgres (9.5)	5m 7s	0s
test-platforms (3.8, ubuntu-latest, asyncio)	5m 19s	0s
test-postgres (9.6)	3m 56s	0s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 29s	0s
test-postgres (10)	4m 28s	0s
test-platforms (3.8, macos-latest, asyncio)	2m 57s	0s
test-postgres (11)	3m 57s	0s
test-platforms (3.8, macos-latest, uvloop)	3m 51s	0s
test-postgres (12)	4m 55s	0s
test-platforms (3.8, windows-latest, asyncio)	5m 48s	0s
test-postgres (13)	3m 51s	0s
test-platforms (3.9, ubuntu-latest, asyncio)	4m 49s	0s
test-postgres (14)	3m 59s	0s
test-platforms (3.9, ubuntu-latest, uvloop)	5m 17s	0s
test-postgres (15)	3m 57s	0s
test-platforms (3.9, macos-latest, asyncio)	5m 12s	0s
test-postgres (16)	4m 55s	0s
test-platforms (3.9, macos-latest, uvloop)	2m 37s	0s
test-platforms (3.9, windows-latest, asyncio)	5m 20s	0s
test-platforms (3.10, ubuntu-latest, asyncio)	3m 20s	0s
test-platforms (3.10, ubuntu-latest, uvloop)	4m 9s	0s
test-platforms (3.10, macos-latest, asyncio)	3m 35s	0s
test-platforms (3.10, macos-latest, uvloop)	3m 0s	0s
test-platforms (3.10, windows-latest, asyncio)	6m 9s	0s
test-platforms (3.11, ubuntu-latest, asyncio)	3m 39s	0s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 24s	0s
test-platforms (3.11, macos-latest, asyncio)	3m 9s	0s
test-platforms (3.11, macos-latest, uvloop)	3m 59s	0s
test-platforms (3.11, windows-latest, asyncio)	5m 24s	0s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 28s	0s
test-platforms (3.12, macos-latest, asyncio)	3m 41s	0s
test-platforms (3.12, windows-latest, asyncio)	6m 22s	0s
Regression Tests	1s	0s
	2h 17m 4s	0s

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