Fix `bulk_update` when using a pk other than `id` #1486

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Job	Run time
test (3.8)	7m 51s
test (3.9)	8m 33s
test (3.10)	8m 45s
test (3.11)	8m 38s
test (3.12)	11m 29s
Finish Coveralls	7s
	45m 23s