Bump third_party/openthread/repo from `f0530af` to `eaa6261` #76437

Job	Run time
Unit / Integration Tests (main)	23m 33s
Unit / Integration Tests (clang)	14m 41s
Unit / Integration Tests (mbedtls)	22m 24s
Unit / Integration Tests (rotating_device_id)	18m 45s
	1h 19m 23s

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