Tests

Bump third_party/openthread/repo from `287dbfa` to `ada03e6` #430

Job	Run time
REPL Tests - Linux	1h 33m 27s
REPL Tests - Darwin	0s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 37m 46s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	1h 56m 11s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 56m 31s
	7h 3m 55s

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