Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #550

Job	Run time
call-workflow / Python 3.11 on macos-14	2m 33s
call-workflow / Python 3.12 on macos-14	3m 47s
call-workflow / Python 3.11 on ubuntu-22.04	3m 33s
call-workflow / Python 3.13 on ubuntu-22.04	10m 49s
call-workflow / Python 3.14 on macos-14	2m 50s
call-workflow / Python 3.13 on macos-14	3m 46s
call-workflow / Python 3.14 on ubuntu-22.04	4m 20s
call-workflow / Python 3.12 on ubuntu-22.04-arm	6m 5s
call-workflow / Python 3.12 on ubuntu-22.04	9m 7s
call-workflow / Python 3.13 on ubuntu-22.04-arm	8m 35s
call-workflow / Python 3.14 on ubuntu-22.04-arm	6m 45s
call-workflow / Python 3.11 on ubuntu-22.04-arm	9m 35s
call-workflow / publish-wheel	-1s
	1h 11m 44s

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