submodule: bump openthread from `d015004` to `74645c0` #1600

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Run time

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Job	Run time
pretty	25s
arm-gcc-4	7m 50s
arm-gcc-5	8m 34s
arm-gcc-6	7m 56s
arm-gcc-7	8m 31s
arm-gcc-9	9m 3s
	42m 19s