Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #541

Job	Run time
call-workflow / Python 3.11 on macos-14	7m 37s
call-workflow / Python 3.12 on ubuntu-22.04-arm	6m 4s
call-workflow / Python 3.14 on macos-14	2m 52s
call-workflow / Python 3.12 on ubuntu-22.04	6m 50s
call-workflow / Python 3.14 on ubuntu-22.04	9m 15s
call-workflow / Python 3.13 on macos-14	3m 55s
call-workflow / Python 3.13 on ubuntu-22.04	3m 15s
call-workflow / Python 3.12 on macos-14	5m 8s
call-workflow / Python 3.13 on ubuntu-22.04-arm	7m 24s
call-workflow / Python 3.11 on ubuntu-22.04	7m 3s
call-workflow / Python 3.11 on ubuntu-22.04-arm	5m 33s
call-workflow / Python 3.14 on ubuntu-22.04-arm	7m 37s
call-workflow / publish-wheel	-1s
	1h 12m 32s

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