Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #557

Job	Run time
call-workflow / Python 3.12 on ubuntu-22.04	4m 47s
call-workflow / Python 3.11 on ubuntu-22.04-arm	8m 35s
call-workflow / Python 3.11 on macos-14	4m 41s
call-workflow / Python 3.13 on macos-14	4m 45s
call-workflow / Python 3.12 on ubuntu-22.04-arm	9m 6s
call-workflow / Python 3.11 on ubuntu-22.04	3m 33s
call-workflow / Python 3.14 on macos-14	7m 15s
call-workflow / Python 3.12 on macos-14	6m 35s
call-workflow / Python 3.14 on ubuntu-22.04-arm	9m 24s
call-workflow / Python 3.14 on ubuntu-22.04	4m 9s
call-workflow / Python 3.13 on ubuntu-22.04	6m 22s
call-workflow / Python 3.13 on ubuntu-22.04-arm	7m 28s
call-workflow / publish-wheel	0s
	1h 16m 40s

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