Bump third_party/pigweed/repo from `1f12d06` to `54ca0db` #2377

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	1h 41m 52s
Build on Linux (gcc_debug)	1h 14m 23s
Build on Linux (python_lib)	3m 2s
Build on Darwin (clang, python_lib, simulated)	3m 36s
Build on Linux (coverage)	17m 56s
Build on Linux (python lighting-app)	3m 5s
	3h 23m 54s

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