[Merge] ~philroche/ubuntu-seeds/+git/ubuntu:feature/mantic-cloud-minimal-cloud-init-gpgconf into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:mantic

[Chad Smith]

upstream cloud-init has landed https://github.com/canonical/cloud-init/pull/4411 to avoid direct dependency on gpgconf utility. 

This is also queued for a bug-fix upload into mantic as 23.3.1-0ubuntu1
- integration-tests have run on lxd_container for mantic passing with no unexpected errors, one preexisting known error


ubuntu-minimal will still need some dependency expressed for `gpg` if it doesn't have that already if we want ubunutu-minimal to support cloud-config containing apt:keyid's like the following: 

#cloud-config
apt:
  sources:
    cloudinit:
      source: 'deb [arch=amd64] http://ppa.launchpad.net/cloud-init-dev/daily/ubuntu focal main'
      keyserver: keyserver.ubuntu.com
      keyid: E4D304DF

-- 
https://code.launchpad.net/~philroche/ubuntu-seeds/+git/ubuntu/+merge/450569
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~philroche/ubuntu-seeds/+git/ubuntu:feature/mantic-cloud-minimal-cloud-init-gpgconf into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:mantic.