Bump third_party/perfetto/repo from `b9aca8f` to `b4e5270` #116685

Job	Run time
Build on Darwin (clang, simulated)	7m 49s
Build on Linux (fake, gcc_release, clang, simulated)	6m 32s
Build on Linux (coverage)	13m 25s
Build on Linux (gcc_debug)	5m 50s
Build on Linux (python_lib)	6m 6s
Build on Linux (python lighting-app)	9m 58s
	49m 40s

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