Ubuntu 22.04 no longer uses gateway4 for default route entry[BUG]

Description
A clear and concise description of what the bug is.
During salt-cloud deploy of ubuntu 22.04 if you use customization it sets the default gatway in netplan config with gateway4: ip address. This is deprecated and needs to be moved to routes statement
Setup
(Please provide relevant configs and/or SLS files (be sure to remove sensitive info. There is no general set-up of Salt.)
cloud.profiles.d file

ubuntults22deploy:
deploy: True
customization: True
provider: name of provider file that links to our vcenter instance
clonefrom: UbuntuRaw
datacenter: our datacenter
folder: systems
cluster: vcenter cluster
devices:
network:
'Network adapter 1':
dvs_switch: 'VMNetwork'
switch_type: distributed
adapter_type: vmxnet3
subnet_mask: 255.255.255.0
dns_servers:

• dns server 1
• dns server 2
  num_cpus: 2
  memory: 8GB
  tags:
  {'Backup': 'Exempt'}
  ssh_username: root
  password:
  minion:
  master: salt master fqdn

This you can use in a map file, so specify it when you deploy

ubuntults22vm:
extends: ubuntults22deploy
Please be as specific as possible and give set-up details.

map file

ubuntults22vm:
testubuntu:
devices:
network:
'Network adapter 1':
name: 'VLANx'
ip: 'x.x.x.x'
subnet_mask: 255.255.255.192
gateway: 'x.xx.x'
domain: "our domain"
minion:
ID: testubuntu

• on-prem machine
• VM (Virtualbox, KVM, etc. please specify)
• VM running on a cloud service, please be explicit and add details
• container (Kubernetes, Docker, containerd, etc. please specify)
• or a combination, please be explicit
• jails if it is FreeBSD
• classic packaging
• onedir packaging
• used bootstrap to install

Steps to Reproduce the behavior
(Include debug logs if possible and relevant)
salt-cloud -m /path_to_above_map_file

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Versions Report

PASTE HERE

Additional context
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