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Bump third_party/ot-br-posix/repo from `bd15f71` to `af26b01` #527

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Run time

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Job	Run time
Chef - ESP32 CI Examples	7m 16s
Chef - Linux CI Examples	5m 59s
Chef - NRFConnect CI Examples	11m 44s
Chef - Telink CI Examples	11m 27s
	36m 26s