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Bump third_party/mbedtls/repo from `5bc604f` to `9870921` #1247

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 39s
Chef - Linux CI Examples	6m 8s
Chef - NRFConnect CI Examples	6m 51s
Chef - Telink CI Examples	12m 6s
	33m 44s