[Merge] ~utkarsh/ubuntu-release-upgrader:prep-final-release-for-mantic into ubuntu-release-upgrader:ubuntu/main

[Utkarsh Gupta]

I confirm that after merging:

- build was successful.
- autopkgtest was successful.
- https://git.launchpad.net/ubuntu-release-upgrader/tree/tests/test_quirks.py has the udpated tests to bump core20 -> core22. Somehow the LP diff doesn't show that.
- firmware-updater comes from desktop-minimal seed. So the metapkg is correct.


Uploading..


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https://code.launchpad.net/~utkarsh/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/452839
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