Bump third_party/ot-br-posix/repo from `636e53d` to `03132d3` #1136

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	1h 15m 50s
Build on Darwin (clang, python_lib, simulated)	1h 24m 19s
Build on Linux (coverage)	10m 30s
Build on Linux (gcc_debug)	34m 36s
Build on Linux (python_lib)	18m 27s
Build on Linux (python lighting-app)	6m 55s
	3h 50m 37s

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