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Bump third_party/libwebsockets/repo from `c57c239` to `3f7c79f` #1914

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 46s
Chef - Linux CI Examples	6m 19s
Chef - NRFConnect CI Examples	11m 55s
Chef - Telink CI Examples	11m 28s
	36m 28s