tests

docs: use lambda over getconn func #4549

Job	Run time
unit tests (3.9)	1m 0s
unit tests (3.13)	1m 0s
integration tests (macos-latest, 3.9)	1m 35s
integration tests (macos-latest, 3.13)	1m 11s
integration tests (windows-latest, 3.9)	1m 39s
integration tests (windows-latest, 3.13)	1m 24s
integration tests (ubuntu-latest, 3.9)	51s
integration tests (ubuntu-latest, 3.13)	1m 19s
	9m 59s

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