setup_root_partition: Increase root partition size

[flaviodsr]

Ardana 8 maintenance update test jobs are failing during the install of cloud-patterns because it does not have enough disk space available.

This change increases the root partition size from 34 GB to 44 GB, the flavors were already updated to reflect that change.

[flaviodsr]

Tested in:

• https://ci.suse.de/blue/organizations/jenkins/cloud-ardana8-job-mu-entry-scale-kvm-deploy-x86_64/detail/cloud-ardana8-job-mu-entry-scale-kvm-deploy-x86_64/89/pipeline/