Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #547

Job	Run time
call-workflow / Python 3.11 on ubuntu-22.04-arm	6m 41s
call-workflow / Python 3.14 on macos-14	5m 22s
call-workflow / Python 3.14 on ubuntu-22.04	9m 46s
call-workflow / Python 3.12 on macos-14	7m 38s
call-workflow / Python 3.13 on macos-14	5m 55s
call-workflow / Python 3.14 on ubuntu-22.04-arm	8m 29s
call-workflow / Python 3.11 on macos-14	5m 17s
call-workflow / Python 3.12 on ubuntu-22.04	5m 38s
call-workflow / Python 3.13 on ubuntu-22.04-arm	6m 38s
call-workflow / Python 3.11 on ubuntu-22.04	4m 58s
call-workflow / Python 3.13 on ubuntu-22.04	6m 28s
call-workflow / Python 3.12 on ubuntu-22.04-arm	5m 26s
call-workflow / publish-wheel	0s
	1h 18m 16s

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