Tests

Bump third_party/pigweed/repo from `9e4bfb9` to `fbb318a` #621

Job	Run time
Test Suites - Linux (no-ble-tsan-clang)	10m 46s
REPL Tests - Linux	22m 15s
Test Suites - Darwin (no-ble-asan-clang)	56m 28s
REPL Tests - Darwin	0s
	1h 29m 29s

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