Bump third_party/pigweed/repo from `1f12d06` to `9ee719d` #1212

Job	Run time
Build on Linux (coverage)	14m 21s
Build on Darwin (clang, python_lib, simulated)	3m 14s
Build on Linux (fake, gcc_release, clang, simulated)	1h 31m 27s
Build on Linux (python_lib)	1m 47s
Build on Linux (gcc_debug)	1h 0m 58s
Build on Linux (python lighting-app)	2m 6s
	2h 53m 53s

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