Build

submodule: bump openthread from `78ecafb` to `f32c18b` #1948

Job	Run time
Docker / metadata / Generate required metadata	1s
Docker / Build	3m 46s
Docker / Tag `latest` and publish to DockerHub	0s
Arm GNU Toolchain 12.2.Rel1	16m 36s
Arm GNU Toolchain 12.3.Rel1	16m 3s
	36m 26s

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