Bump third_party/pigweed/repo from `ce0e3e2` to `447364e` #1045

Job	Run time
REPL Tests - Darwin	0s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 47m 0s
REPL Tests - Linux	1h 37m 18s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	2h 6m 5s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	1h 57m 7s
	7h 27m 30s

Provide feedback