Bump third_party/ot-br-posix/repo from `bd15f71` to `23149c3` #1658

Job	Run time
Unit / Integration Tests (main)	16m 49s
Unit / Integration Tests (clang)	21m 0s
Unit / Integration Tests (mbedtls)	14m 48s
Unit / Integration Tests (rotating_device_id)	14m 25s
Unit / Integration Tests (icd)	46m 5s
	1h 53m 7s

Provide feedback