Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #551

Job	Run time
call-workflow / Python 3.11 on ubuntu-22.04	10m 43s
call-workflow / Python 3.11 on ubuntu-22.04-arm	5m 30s
call-workflow / Python 3.12 on ubuntu-22.04	8m 12s
call-workflow / Python 3.13 on ubuntu-22.04	7m 48s
call-workflow / Python 3.12 on macos-14	3m 43s
call-workflow / Python 3.11 on macos-14	4m 21s
call-workflow / Python 3.13 on macos-14	5m 17s
call-workflow / Python 3.13 on ubuntu-22.04-arm	8m 54s
call-workflow / Python 3.12 on ubuntu-22.04-arm	3m 49s
call-workflow / Python 3.14 on macos-14	2m 26s
call-workflow / Python 3.14 on ubuntu-22.04-arm	4m 34s
call-workflow / Python 3.14 on ubuntu-22.04	8m 56s
call-workflow / publish-wheel	0s
	1h 14m 13s

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