Bump third_party/pigweed/repo from `d5fcc90` to `5eec847` #1243

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	7m 9s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 39m 17s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	7m 2s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	2h 24m 3s
	4h 17m 31s

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