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Bump third_party/openthread/repo from `aed9cd1` to `54f6c27` #1886

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Run time

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Job	Run time
Chef - ESP32 CI Examples	11m 32s
Chef - Linux CI Examples	10m 42s
Chef - NRFConnect CI Examples	11m 55s
Chef - Telink CI Examples	11m 54s
	46m 3s