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Bump third_party/ot-br-posix/repo from `58822dc` to `02421b0` #38781

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 6s
Chef - Linux CI Examples	6m 21s
Chef - NRFConnect CI Examples	7m 44s
Chef - Telink CI Examples	7m 51s
	31m 2s