Build example - ESP32

Bump third_party/openthread/repo from `b78b71b` to `666a9bd` #1182

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

Run time

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Job	Run time
ESP32	47m 48s
ESP32_1	30m 15s
	1h 18m 3s