Ubuntu image is deprecated, bump to supported image

[chrisjsimpson]

Is your feature request related to a problem? Please describe.
See additional context.

server-bootstrap/src/vpn/playbooks/create-rebuild-vpn-server.yml

Line 45 in 5d5bdbf

image: ubuntu-20.04

Describe the solution you'd like
Bump to suported image ubuntu-22.04 at minimum , vpn depedency supporting

https://docs.hetzner.cloud/reference/cloud#images-list-images

Describe alternatives you've considered

Additional context
Image removed from the Hetzner api

\"/tmp/ansible_hetzner.hcloud.server_payload_qex1na9r/ansible_hetzner.hcloud.server_payload.zip/ansible_collections/hetzner/hcloud/plugins/module_utils/vendor/hcloud/_client.py\", line 296, in request\n  File \"/tmp/ansible_hetzner.hcloud.server_payload_qex1na9r/ansible_hetzner.hcloud.server_payload.zip/ansible_collections/hetzner/hcloud/plugins/module_utils/vendor/hcloud/_client.py\", line 334, in _read_response\nansible_collections.hetzner.hcloud.plugins.module_utils.vendor.hcloud._exceptions.APIException: image not found (not_found)\n", "module_stdout": "", "msg": "MODULE FAILURE: No start of json char found\nSee stdout/stderr for the exact error", "rc": 1}