Build

submodule: bump openthread from `b42be4c` to `a9805ed` (#980) #2349

Job	Run time
Docker / metadata / Generate required metadata	1s
Docker / Build	3m 19s
Arm GNU Toolchain 12.2.Rel1	18m 37s
Arm GNU Toolchain 12.3.Rel1	18m 30s
DockerHub Publish / Tag `latest` and publish to DockerHub	1m 17s
	41m 44s

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