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Bump third_party/imgui/repo from `3c435c0` to `28caa22` #1146

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 15s
Chef - Linux CI Examples	6m 7s
Chef - NRFConnect CI Examples	11m 40s
Chef - Telink CI Examples	11m 34s
	42m 36s