Build

submodule: bump openthread from `20c9bcb` to `b301a4c` #1953

Job	Run time
Docker / metadata / Generate required metadata	1s
Docker / Build	3m 0s
Docker / Tag `latest` and publish to DockerHub	0s
Arm GNU Toolchain 12.2.Rel1	15m 34s
Arm GNU Toolchain 12.3.Rel1	15m 32s
	34m 7s

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