Build Chef CI examples on all platforms

Bump third_party/openthread/repo from `2aeb8b8` to `f6cee79` #3512

Sign in to view logs

Run time

Learn about OS pricing on GitHub Actions

Job	Run time
Chef - ESP32 CI Examples	8m 21s
Chef - Linux CI Examples	6m 21s
Chef - NRFConnect CI Examples	12m 0s
Chef - Telink CI Examples	11m 31s
	38m 13s