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Bump third_party/imgui/repo from `3c435c0` to `3b8c7d0` #1249

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 51s
Chef - Linux CI Examples	5m 34s
Chef - NRFConnect CI Examples	12m 27s
Chef - Telink CI Examples	12m 32s
	44m 24s