Bump third_party/perfetto/repo from `b9aca8f` to `20ed12d` #2293

Job	Run time
Test Suites - Darwin (no-ble-asan-clang)	1h 19m 53s
Test Suites - Linux (no-ble-tsan-clang)	6m 19s
Test Suites - Darwin (no-ble-tsan-clang)	1h 49m 5s
REPL Tests - Darwin	0s
REPL Tests - Linux	2m 4s
	3h 17m 21s

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