Bump third_party/openthread/repo from `eaa6261` to `652e3f2` #1571

Job	Run time
Unit / Integration Tests (main)	24m 10s
Unit / Integration Tests (clang)	15m 49s
Unit / Integration Tests (mbedtls)	23m 52s
Unit / Integration Tests (rotating_device_id)	22m 30s
	1h 26m 21s

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