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Bump third_party/libwebsockets/repo from `c57c239` to `3f7c79f` #926

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Job	Run time
Chef - ESP32 CI Examples	8m 57s
Chef - Linux CI Examples	5m 34s
Chef - NRFConnect CI Examples	6m 44s
Chef - Telink CI Examples	7m 10s
	28m 25s