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Bump third_party/libwebsockets/repo from `cfa9d88` to `1239a2b` #260

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 21s
Chef - Linux CI Examples	7m 4s
Chef - NRFConnect CI Examples	7m 47s
Chef - Telink CI Examples	8m 18s
	32m 30s