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Bump third_party/libwebsockets/repo from `c57c239` to `a656eb5` #1920

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 49s
Chef - Linux CI Examples	6m 16s
Chef - NRFConnect CI Examples	11m 43s
Chef - Telink CI Examples	7m 11s
	31m 59s