Fix concurrent read determinism and file descriptor leaks in ArrayRecordDataSource. #548

Job	Run time
call-workflow / Python 3.12 on macos-14	5m 48s
call-workflow / Python 3.11 on ubuntu-22.04-arm	2m 48s
call-workflow / Python 3.11 on macos-14	5m 0s
call-workflow / Python 3.13 on ubuntu-22.04	4m 36s
call-workflow / Python 3.12 on ubuntu-22.04-arm	2m 54s
call-workflow / Python 3.14 on macos-14	3m 45s
call-workflow / Python 3.12 on ubuntu-22.04	11m 19s
call-workflow / Python 3.14 on ubuntu-22.04-arm	4m 33s
call-workflow / Python 3.13 on ubuntu-22.04-arm	4m 40s
call-workflow / Python 3.13 on macos-14	52s
call-workflow / Python 3.11 on ubuntu-22.04	10m 9s
call-workflow / Python 3.14 on ubuntu-22.04	11m 19s
call-workflow / publish-wheel	-1s
	1h 7m 42s

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