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Bump third_party/libwebsockets/repo from `cfa9d88` to `1239a2b` #259

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 11s
Chef - Linux CI Examples	6m 24s
Chef - NRFConnect CI Examples	7m 51s
Chef - Telink CI Examples	7m 37s
	31m 3s