Bump third_party/pigweed/repo from `d5fcc90` to `be43983` #1231

Job	Run time
REPL Tests - Linux	6m 44s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 37m 47s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	6m 37s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 47m 40s
REPL Tests - Darwin	0s
	3h 38m 48s

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