Bump third_party/openthread/repo from `f0b6fce` to `5f74baa` #2318

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1h 3m 23s
Test Suites - Linux (no-ble-tsan-clang)	1h 8m 26s
Test Suites - Darwin (no-ble-asan-clang)	1s
Test Suites - Darwin (no-ble-tsan-clang)	1s
	2h 11m 51s

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