submodule: bump third_party/openthread/repo from `f6cee79` to `0c3d2c… #6779

Job	Run time
docker-check	4m 5s
docker-check	4m 5s
docker-check	4m 5s
buildx (latest, ubuntu:bionic, linux/amd64,linux/arm/v7,linux/arm64, yes)	32m 3s
buildx (latest, ubuntu:bionic, linux/amd64,linux/arm/v7,linux/arm64, yes)	32m 3s
buildx (latest, ubuntu:bionic, linux/amd64,linux/arm/v7,linux/arm64, yes)	32m 3s
buildx (focal, ubuntu:focal, linux/amd64,linux/arm64, yes)	23m 38s
buildx (focal, ubuntu:focal, linux/amd64,linux/arm64, yes)	23m 38s
buildx (focal, ubuntu:focal, linux/amd64,linux/arm64, yes)	23m 38s
buildx (jammy, ubuntu:jammy, linux/amd64,linux/arm64, yes)	21m 22s
buildx (jammy, ubuntu:jammy, linux/amd64,linux/arm64, yes)	21m 22s
buildx (jammy, ubuntu:jammy, linux/amd64,linux/arm64, yes)	21m 22s
buildx (reference-device, ubuntu:bionic, --build-arg REFERENCE_DEVICE=1 --build-arg BORDER_ROUTIN...	28m 50s
buildx (reference-device, ubuntu:bionic, --build-arg REFERENCE_DEVICE=1 --build-arg BORDER_ROUTIN...	28m 50s
buildx (reference-device, ubuntu:bionic, --build-arg REFERENCE_DEVICE=1 --build-arg BORDER_ROUTIN...	28m 50s
buildx (test, ubuntu:bionic, --build-arg OT_BACKBONE_CI=1 --build-arg REFERENCE_DEVICE=1 --build-...	13m 6s
buildx (test, ubuntu:bionic, --build-arg OT_BACKBONE_CI=1 --build-arg REFERENCE_DEVICE=1 --build-...	5m 29s
buildx (test, ubuntu:bionic, --build-arg OT_BACKBONE_CI=1 --build-arg REFERENCE_DEVICE=1 --build-...	33m 3s
	6h 21m 32s

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