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Bump third_party/ot-br-posix/repo from `bd15f71` to `722f283` #3475

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 5s
Chef - Linux CI Examples	5m 42s
Chef - Telink CI Examples	12m 1s
Chef - NRFConnect CI Examples	12m 10s
	38m 58s