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Bump third_party/imgui/repo from `6228c2e` to `96839b4` #577

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 1s
Chef - Linux CI Examples	6m 28s
Chef - NRFConnect CI Examples	7m 45s
Chef - Telink CI Examples	7m 40s
	30m 54s