Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #538

Job	Run time
call-workflow / Python 3.11 on ubuntu-22.04-arm	4m 39s
call-workflow / Python 3.14 on ubuntu-22.04	9m 43s
call-workflow / Python 3.13 on ubuntu-22.04-arm	9m 14s
call-workflow / Python 3.14 on ubuntu-22.04-arm	7m 27s
call-workflow / Python 3.11 on ubuntu-22.04	5m 48s
call-workflow / Python 3.13 on macos-14	7m 9s
call-workflow / Python 3.13 on ubuntu-22.04	2m 33s
call-workflow / Python 3.12 on ubuntu-22.04-arm	4m 26s
call-workflow / Python 3.12 on ubuntu-22.04	3m 23s
call-workflow / Python 3.11 on macos-14	3m 44s
call-workflow / Python 3.12 on macos-14	8m 8s
call-workflow / Python 3.14 on macos-14	5m 38s
call-workflow / publish-wheel	0s
	1h 11m 52s

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