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Bump third_party/imgui/repo from `2860d7b` to `df31774` #930

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 21s
Chef - Linux CI Examples	4m 49s
Chef - NRFConnect CI Examples	6m 49s
Chef - Telink CI Examples	9m 40s
	29m 39s