Build

submodule: bump openthread from `a0ba929` to `6f12c81` #1930

Job	Run time
Docker / metadata / Generate required metadata	1s
Docker / Build	5m 27s
Docker / Tag `latest` and publish to DockerHub	0s
Arm GNU Toolchain 12.2.Rel1	17m 19s
Arm GNU Toolchain 12.3.Rel1	16m 55s
	39m 42s

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