Bump third_party/openthread/repo from `aed9cd1` to `722b150` #1946

Job	Run time
Unit / Integration Tests (main)	15m 44s
Unit / Integration Tests (clang)	18m 11s
Unit / Integration Tests (mbedtls)	16m 10s
Unit / Integration Tests (rotating_device_id)	16m 16s
Unit / Integration Tests (icd)	47m 2s
	1h 53m 23s

Provide feedback