Build

submodule: bump openthread from `a9805ed` to `7886083` #2370

Job	Run time
Docker / metadata / Generate required metadata	1s
Docker / Build	3m 13s
Arm GNU Toolchain 12.2.Rel1	19m 14s
Arm GNU Toolchain 12.3.Rel1	18m 59s
DockerHub Publish	0s
	41m 27s

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