Bump third_party/ot-br-posix/repo from `bd15f71` to `e24a709` #5452

Job	Run time
Unit / Integration Tests (main)	16m 32s
Unit / Integration Tests (clang)	18m 9s
Unit / Integration Tests (mbedtls)	15m 41s
Unit / Integration Tests (rotating_device_id)	16m 46s
Unit / Integration Tests (icd)	46m 19s
	1h 53m 27s

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