Tests

Bump third_party/pigweed/repo from `9e4bfb9` to `865e6cc` #860

Job	Run time
Test Suites - Linux (no-ble-tsan-clang)	10m 57s
REPL Tests - Darwin	0s
REPL Tests - Linux	22m 29s
Test Suites - Darwin (no-ble-asan-clang)	53m 22s
	1h 26m 48s

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