Build Chef CI examples on all platforms

Bump third_party/imgui/repo from `3c435c0` to `87f3109` #3499

Sign in to view logs

Run time

Learn about OS pricing on GitHub Actions

Job	Run time
Chef - ESP32 CI Examples	9m 1s
Chef - Linux CI Examples	6m 11s
Chef - NRFConnect CI Examples	6m 56s
Chef - Telink CI Examples	6m 54s
	29m 2s