Bump third_party/pigweed/repo from `ce0e3e2` to `ce9b2de` #2425

Job	Run time
Unit / Integration Tests (main)	17m 32s
Unit / Integration Tests (clang)	17m 56s
Unit / Integration Tests (mbedtls)	15m 24s
Unit / Integration Tests (rotating_device_id)	16m 43s
Unit / Integration Tests (icd)	45m 40s
	1h 53m 15s

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