Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #537

Job	Run time
call-workflow / Python 3.12 on ubuntu-22.04-arm	6m 8s
call-workflow / Python 3.11 on macos-14	8m 1s
call-workflow / Python 3.12 on macos-14	7m 52s
call-workflow / Python 3.11 on ubuntu-22.04	10m 33s
call-workflow / Python 3.12 on ubuntu-22.04	9m 15s
call-workflow / Python 3.13 on ubuntu-22.04	10m 54s
call-workflow / Python 3.11 on ubuntu-22.04-arm	5m 49s
call-workflow / Python 3.14 on ubuntu-22.04	7m 48s
call-workflow / Python 3.13 on macos-14	3m 26s
call-workflow / Python 3.14 on macos-14	2m 15s
call-workflow / Python 3.13 on ubuntu-22.04-arm	5m 59s
call-workflow / Python 3.14 on ubuntu-22.04-arm	5m 39s
call-workflow / publish-wheel	0s
	1h 23m 39s

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