Bump third_party/perfetto/repo from `b9aca8f` to `42aaaaa` #5564

Job	Run time
Build on Linux (gcc_debug)	3m 3s
Build on Linux (fake, gcc_release, clang, simulated)	2m 7s
Build on Linux (python_lib)	3m 18s
Build on Linux (python lighting-app)	7m 3s
Build on Darwin (clang, simulated)	7m 32s
Build on Linux (coverage)	15m 37s
	38m 40s

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