Build Chef CI examples on all platforms

Bump third_party/openthread/repo from `d4155e4` to `a8afffb` #675

Sign in to view logs

Run time

Learn about OS pricing on GitHub Actions

Job	Run time
Chef - ESP32 CI Examples	9m 22s
Chef - Linux CI Examples	7m 3s
Chef - NRFConnect CI Examples	9m 35s
	26m 0s