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Bump third_party/pigweed/repo from `0380161` to `a2b21f2` #41711

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 27s
Chef - NRFConnect CI Examples	7m 53s
Chef - Linux CI Examples	6m 19s
Chef - Telink CI Examples	7m 35s
	31m 14s