Tests

Bump third_party/pigweed/repo from `d5fcc90` to `2ef9913` #1014

Job	Run time
Test Suites - Darwin (no-ble-asan-clang)	1h 43m 3s
Test Suites - Darwin (no-ble-tsan-clang)	1h 52m 48s
Test Suites - Linux (no-ble-tsan-clang)	6m 26s
REPL Tests - Darwin	0s
REPL Tests - Linux	7m 8s
	3h 49m 25s

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