submodule: bump openthread from `3a28b7b` to `09698fa` #1620

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Run time

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Job	Run time
pretty	28s
arm-gcc-4	8m 14s
arm-gcc-5	7m 42s
arm-gcc-6	7m 36s
arm-gcc-7	7m 58s
arm-gcc-9	7m 43s
	39m 41s