Bump third_party/pigweed/repo from `1f12d06` to `63ebec1` #908

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	6m 56s
Test Suites - Linux (no-ble-tsan-clang)	2m 2s
Test Suites - Darwin (no-ble-asan-clang)	3m 8s
Test Suites - Darwin (no-ble-tsan-clang)	1s
	12m 7s

Provide feedback