Tests

Bump third_party/openthread/repo from `2aeb8b8` to `5bd9de5` #1603

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1h 30m 26s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 31m 59s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 53m 24s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	2h 2m 54s
	6h 58m 43s

Provide feedback