Bump third_party/pigweed/repo from `ce0e3e2` to `2e04aa4` #1068

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	2m 45s
Build on Linux (gcc_debug)	1m 56s
Build on Linux (python_lib)	1m 53s
Build on Linux (python lighting-app)	2m 58s
Build on Darwin (clang, simulated)	4m 22s
Build on Linux (coverage)	3m 1s
	16m 55s

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