Bump third_party/pigweed/repo from `1f12d06` to `fba0833` #1587

Job	Run time
Build on Darwin (clang, python_lib, simulated)	3m 18s
Build on Linux (fake, gcc_release, clang, simulated)	1h 33m 43s
Build on Linux (coverage)	13m 33s
Build on Linux (gcc_debug)	57m 57s
Build on Linux (python_lib)	21m 31s
Build on Linux (python lighting-app)	5m 34s
	3h 15m 36s

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