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Bump third_party/openthread/repo from `2aeb8b8` to `287dbfa` (#36012) #59265

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Run time

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Job	Run time
Chef - ESP32 CI Examples	21m 56s
Chef - Linux CI Examples	6m 7s
Chef - NRFConnect CI Examples	12m 41s
Chef - Telink CI Examples	7m 0s
	47m 44s