submodule: bump openthread from `6771761` to `df757ba` (#864) #1678

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Run time

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Job	Run time
pretty	21s
arm-gcc-4	15m 29s
arm-gcc-5	15m 11s
arm-gcc-6	16m 9s
arm-gcc-7	16m 14s
arm-gcc-9	16m 35s
	1h 19m 59s