Bump third_party/pigweed/repo from `1f12d06` to `c221c63` #901

Job	Run time
Build on Darwin (clang, python_lib, simulated)	4m 3s
Build on Linux (fake, gcc_release, clang, simulated)	1h 48m 13s
Build on Linux (gcc_debug)	1h 17m 54s
Build on Linux (python_lib)	3m 50s
Build on Linux (python lighting-app)	3m 15s
Build on Linux (coverage)	21m 48s
	3h 39m 3s

Provide feedback