Bump third_party/ot-br-posix/repo from `bd15f71` to `b041fa5` #5562

Job	Run time
Build on Darwin (clang, simulated)	57m 47s
Build on Linux (fake, gcc_release, clang, simulated)	54m 46s
Build on Linux (coverage)	15m 14s
Build on Linux (gcc_debug)	1h 4m 43s
Build on Linux (python_lib)	23m 4s
Build on Linux (python lighting-app)	5m 58s
	3h 41m 32s

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