submodule: bump openthread from `3702c88` to `9277bce` #1666

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Run time

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Job	Run time
pretty	20s
arm-gcc-4	8m 19s
arm-gcc-5	8m 19s
arm-gcc-6	8m 18s
arm-gcc-7	8m 23s
arm-gcc-9	8m 47s
	42m 26s