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Bump third_party/libwebsockets/repo from `c57c239` to `a74362f` #3491

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Run time

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Job	Run time
Chef - ESP32 CI Examples	14m 14s
Chef - Linux CI Examples	5m 30s
Chef - NRFConnect CI Examples	11m 51s
Chef - Telink CI Examples	11m 49s
	43m 24s