submodule: bump openthread from `19dadd9` to `6771761` #1675

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Run time

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Job	Run time
arm-gcc-4	14m 49s
pretty	35s
arm-gcc-5	15m 39s
arm-gcc-6	16m 50s
arm-gcc-7	16m 6s
arm-gcc-9	16m 26s
	1h 20m 25s