Disable JIT while doing type introspection #456

Job	Run time
test-postgres (9.5)	3m 33s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 25s
test-postgres (9.6)	3m 20s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 33s
test-postgres (10)	2m 45s
test-platforms (3.8, macos-latest, asyncio)	2m 53s
test-postgres (11)	3m 8s
test-platforms (3.8, macos-latest, uvloop)	2m 58s
test-postgres (12)	2m 50s
test-platforms (3.8, windows-latest, asyncio)	7m 23s
test-postgres (13)	2m 51s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 12s
test-postgres (14)	3m 18s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 7s
test-postgres (15)	3m 4s
test-platforms (3.9, macos-latest, asyncio)	3m 2s
test-platforms (3.9, macos-latest, uvloop)	3m 5s
test-platforms (3.9, windows-latest, asyncio)	7m 3s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 26s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 4s
test-platforms (3.10, macos-latest, asyncio)	4m 48s
test-platforms (3.10, macos-latest, uvloop)	2m 55s
test-platforms (3.10, windows-latest, asyncio)	4m 39s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 16s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 9s
test-platforms (3.11, macos-latest, asyncio)	3m 15s
test-platforms (3.11, macos-latest, uvloop)	4m 45s
test-platforms (3.11, windows-latest, asyncio)	7m 22s
Regression Tests	3s
	1h 37m 12s

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