Get rid of gdisk dependency
Jira: https://issues.redhat.com/browse/RHEL-36093
gdisk is not going to be shipped in RHEL10 as sfdisk is perfectly capable of dealing with GPT partition tables. cloud-init's upstream still relies on sgdisk for GPT and is reluctant to do the switch, do this downstream only for now.
X-downstream-only: true
Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com