Bump third_party/perfetto/repo from `b9aca8f` to `20ed12d` #2318

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1m 55s
Test Suites - Darwin (no-ble-asan-clang)	1h 29m 14s
Test Suites - Linux (no-ble-tsan-clang)	1m 50s
Test Suites - Darwin (no-ble-tsan-clang)	1h 57m 46s
	3h 30m 45s

Provide feedback