Tests

Bump third_party/pigweed/repo from `d5fcc90` to `29c5be4` #1032

Job	Run time
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 24m 1s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	6m 48s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 45m 3s
REPL Tests - Darwin	0s
REPL Tests - Linux	7m 9s
	3h 23m 1s

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