submodule: bump openthread from `a6d6073` to `3a28b7b` (#840) #1628

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Run time

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Job	Run time
pretty	35s
arm-gcc-5	10m 55s
arm-gcc-6	12m 14s
arm-gcc-7	12m 25s
arm-gcc-9	12m 50s
	48m 59s