[Merge] ~ubuntu-core-dev/ubuntu/+source/systemd:lp1945225 into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-focal

[Dimitri John Ledkov]

If we merge and release this, we should also keep core-initrd's build of systemd using the v245 default naming scheme on UC20.
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https://code.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/+git/systemd/+merge/409304
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