Build example - ESP32

Bump third_party/ot-br-posix/repo from `bd15f71` to `b9210e7` #296

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

Run time

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Job	Run time
ESP32	1h 3m 27s
ESP32_1	50m 31s
	1h 53m 58s