Bump third_party/ot-br-posix/repo from `bd15f71` to `04bbe75` #397

Job	Run time
Unit / Integration Tests (main)	16m 22s
Unit / Integration Tests (clang)	17m 24s
Unit / Integration Tests (mbedtls)	16m 47s
Unit / Integration Tests (rotating_device_id)	16m 33s
Unit / Integration Tests (icd)	46m 40s
	1h 53m 46s

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