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Bump third_party/libwebsockets/repo from `ec6d5ac` to `18fdb0d` #2691

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Job	Run time
Chef - ESP32 CI Examples	16m 59s
Chef - Linux CI Examples	9m 53s
Chef - NRFConnect CI Examples	13m 17s
Chef - Telink CI Examples	4m 25s
	44m 34s