Tests

Bump third_party/openthread/repo from `f0b6fce` to `69b91f9` #2408

Job	Run time
REPL Tests - Linux	1h 3m 28s
REPL Tests - Darwin	0s
Test Suites - Darwin (no-ble-asan-clang)	1h 23m 52s
Test Suites - Darwin (no-ble-tsan-clang)	1h 42m 10s
Test Suites - Linux (no-ble-tsan-clang)	1h 47m 54s
	5h 57m 24s

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