Tests

ci: bump actions/checkout from 3.6.0 to 4.0.0 #6273

Job	Run time
Get Docker tags from file	3s
tests 3.8 / ubuntu-latest	33s
Type checking (3.8)	40s
tests 3.9 / ubuntu-latest	47s
Type checking (3.9)	51s
tests 3.10 / ubuntu-latest	42s
Type checking (3.10)	44s
tests 3.11 / ubuntu-latest	48s
Type checking (3.11)	54s
tests 3.12 / ubuntu-latest	1m 6s
Type checking (3.12)	49s
tests pypy3.9 / ubuntu-latest	51s
tests pypy3.10 / ubuntu-latest	1m 3s
xdoctest 3.11 / ubuntu-latest	31s
tests 3.13 / ubuntu-latest	1m 6s
tests 3.11 / windows-latest	2m 4s
tests 3.11 / macos-latest	1m 18s
integration 3.11 / 6-apache / postgres	2m 14s
integration 3.11 / 6.2.4-230825-apache / postgres	2m 2s
integration 3.11 / 5-apache / postgres	2m 7s
integration 3.11 / 5.6.35-230822-apache / postgres	1m 57s
integration 3.11 / 6.2.3-230821-apache / postgres	2m 1s
integration 3.11 / 5.6.34-230816-apache / postgres	2m 10s
integration 3.11 / 6.2.2-230814-apache / postgres	2m 20s
integration 3.11 / 5.6.33-230808-apache / postgres	1m 58s
integration 3.11 / 6-apache / mysql	2m 5s
integration pypy3.9 / 6-apache / postgres	2m 29s
integration 3.11 / refs/heads/5.x / postgres	3m 56s
integration 3.11 / refs/heads/develop / postgres	4m 15s
integration 3.11 / refs/heads/master / postgres	4m 16s
Coverage (unit)	37s
Coverage (integration)	29s
	49m 46s

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