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Bump third_party/ot-br-posix/repo from `bd15f71` to `5c66507` #1912

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Run time

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Job	Run time
Chef - Linux CI Examples	5m 55s
Chef - ESP32 CI Examples	13m 0s
Chef - NRFConnect CI Examples	11m 57s
Chef - Telink CI Examples	12m 13s
	43m 5s