Bump third_party/openthread/repo from `f1e74a0` to `00076af` #88389

Job	Run time
Build on Linux (gcc_debug)	48m 10s
Build on Darwin (clang, python_lib, simulated)	1h 25m 32s
Build on Linux (fake, gcc_release, clang, simulated)	1h 25m 33s
Build on Linux (coverage)	9m 53s
Build on Linux (python_lib)	19m 49s
Build on Linux (python lighting-app)	6m 5s
	4h 15m 2s

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