[Merge] ~paelzer/ubuntu-seeds/+git/platform:promote-runc-containerd-20.04 into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:focal

[Christian Ehrhardt ]

Thanks, pushed - lets see in a bit if things show up in mismatches (as we have no other ties to them).
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https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+merge/380071
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