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Bump third_party/imgui/repo from `3c435c0` to `605c8d7` #1518

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 24s
Chef - Linux CI Examples	5m 45s
Chef - Telink CI Examples	11m 31s
Chef - NRFConnect CI Examples	12m 30s
	43m 10s