submodule: bump openthread from `a6d6073` to `3a28b7b` #1753

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Run time

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Job	Run time
pretty	24s
arm-gcc-4	15m 2s
arm-gcc-5	15m 6s
arm-gcc-6	15m 31s
arm-gcc-7	15m 4s
arm-gcc-9	16m 14s
	1h 17m 21s