Bump third_party/pigweed/repo from `1f12d06` to `f66eafb` #889

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1h 3m 2s
Test Suites - Darwin (no-ble-asan-clang)	2m 58s
Test Suites - Linux (no-ble-tsan-clang)	1m 34s
Test Suites - Darwin (no-ble-tsan-clang)	53s
	1h 8m 27s

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