[Merge] ~ubuntu-core-dev/grub/+git/ubuntu:focal-devel into ~ubuntu-core-dev/grub/+git/ubuntu:focal

[Dimitri John Ledkov]

focal-security is dropped.

what is in the archive, now pushed and matches what is in the focal branch.

do rebase focal-devel onto focal.
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https://code.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/+merge/388418
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