submodule: bump openthread from `af2c77e` to `b42be4c` #1746

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Run time

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Job	Run time
pretty	39s
arm-gcc-4	16m 2s
arm-gcc-5	15m 49s
arm-gcc-6	15m 11s
arm-gcc-7	15m 31s
arm-gcc-9	16m 5s
	1h 19m 17s