Build

submodule: bump openthread from `7ec2c31` to `4cc1ffd` #2127

Job	Run time
Docker / metadata / Generate required metadata	1s
Docker / Build	3m 5s
Arm GNU Toolchain 12.2.Rel1	16m 32s
Arm GNU Toolchain 12.3.Rel1	17m 16s
DockerHub Publish	0s
	36m 54s

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