Bump third_party/pigweed/repo from `1f12d06` to `2005f5e` #1522

Job	Run time
Build on Darwin (clang, python_lib, simulated)	2m 57s
Build on Linux (fake, gcc_release, clang, simulated)	1m 54s
Build on Linux (coverage)	16m 39s
Build on Linux (gcc_debug)	1h 5m 57s
Build on Linux (python_lib)	2m 20s
Build on Linux (python lighting-app)	3m 1s
	1h 32m 48s

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