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Bump third_party/libwebsockets/repo from `c57c239` to `a656eb5` #929

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 28s
Chef - Linux CI Examples	4m 35s
Chef - NRFConnect CI Examples	9m 41s
Chef - Telink CI Examples	6m 39s
	29m 23s