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Bump third_party/libwebsockets/repo from `c57c239` to `ef4a85d` #933

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Run time

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Job	Run time
Chef - ESP32 CI Examples	1m 10s
Chef - Linux CI Examples	4m 55s
Chef - NRFConnect CI Examples	1m 39s
Chef - Telink CI Examples	1m 32s
	9m 16s