Tests

Bump third_party/openthread/repo from `f0b6fce` to `5e34ab2` #2291

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1h 5m 22s
Test Suites - Darwin (no-ble-asan-clang)	1h 16m 31s
Test Suites - Darwin (no-ble-tsan-clang)	1h 58m 59s
Test Suites - Linux (no-ble-tsan-clang)	1h 40m 58s
	6h 1m 50s

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