Bump third_party/pigweed/repo from `9504c03` to `24bec3c` #1081

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	6m 7s
Build on Linux (gcc_debug)	6m 24s
Build on Linux (python lighting-app)	7m 40s
Build on Darwin (clang, python_lib, simulated)	3m 9s
Build on Linux (coverage)	7m 13s
Build on Linux (python_lib)	6m 0s
	36m 33s

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