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Bump third_party/ot-br-posix/repo from `636e53d` to `69ce2a5` #361

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 35s
Chef - Linux CI Examples	9m 51s
Chef - Telink CI Examples	15m 23s
Chef - NRFConnect CI Examples	12m 18s
	51m 7s