Tests

Bump third_party/pigweed/repo from `9e4bfb9` to `177cb2c` #848

Job	Run time
REPL Tests - Linux	15m 58s
Test Suites - Darwin (no-ble-asan-clang)	45m 45s
Test Suites - Linux (no-ble-tsan-clang)	10m 23s
REPL Tests - Darwin	0s
	1h 12m 6s

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