Build example - ESP32

Bump third_party/pigweed/repo from `1f12d06` to `8512b20` #297

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Summary
Jobs
- ESP32
- ESP32_1
Run details
- Usage
- Workflow file

Run time

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Job	Run time
ESP32	38m 35s
ESP32_1	45m 57s
	1h 24m 32s