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Bump third_party/mbedtls/repo from `c10520f` to `198fbc2` #805

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Run time

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Job	Run time
Chef - ESP32 CI Examples	15m 26s
Chef - Linux CI Examples	8m 40s
Chef - NRFConnect CI Examples	14m 35s
Chef - Telink CI Examples	14m 3s
	52m 44s