Bump third_party/pigweed/repo from `1f12d06` to `54ca0db` #2370

Job	Run time
Test Suites - Linux (no-ble-tsan-clang)	6m 47s
REPL Tests - Darwin	0s
REPL Tests - Linux	6m 52s
Test Suites - Darwin (no-ble-asan-clang)	3m 2s
Test Suites - Darwin (no-ble-tsan-clang)	3m 9s
	19m 50s

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