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Bump third_party/ot-br-posix/repo from `2dfff2a` to `4e55cc0` #1004

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Run time

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Job	Run time
Chef - ESP32 CI Examples	17m 2s
Chef - Linux CI Examples	8m 55s
Chef - NRFConnect CI Examples	14m 45s
Chef - Telink CI Examples	10m 25s
	51m 7s