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Bump third_party/ot-br-posix/repo from `c5a7a35` to `9bdaa91` (#32200) #41607

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 6s
Chef - Linux CI Examples	6m 45s
Chef - NRFConnect CI Examples	7m 46s
Chef - Telink CI Examples	7m 51s
	31m 28s