Bump third_party/pigweed/repo from `9504c03` to `24bec3c` #1080

Job	Run time
Build on Darwin (clang, python_lib, simulated)	3m 53s
Build on Linux (fake, gcc_release, clang, simulated)	3m 55s
Build on Linux (coverage)	3m 32s
Build on Linux (gcc_debug)	3m 32s
Build on Linux (python_lib)	3m 36s
Build on Linux (python lighting-app)	3m 9s
	21m 37s

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