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Bump third_party/pigweed/repo from `ce0e3e2` to `f7a18a2` #1723

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 57s
Chef - Linux CI Examples	5m 41s
Chef - NRFConnect CI Examples	7m 20s
Chef - Telink CI Examples	12m 47s
	39m 45s