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Bump third_party/ot-br-posix/repo from `bd15f71` to `a716787` #1952

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Run time

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Job	Run time
Chef - ESP32 CI Examples	11m 43s
Chef - Linux CI Examples	5m 35s
Chef - NRFConnect CI Examples	39m 15s
Chef - Telink CI Examples	11m 32s
	1h 8m 5s