fix: fix unmarshal_ServerType

[bprus]

When trying to get available server types:

    client = Client.from_env()
    instance_api = InstanceV1API(client=client)
    instance_types = instance_api.list_servers_types().servers

It fails with:

Traceback (most recent call last):
  File ".../debug.py", line 7, in <module>
    _get_node_groups_scw(cluster_name="xxx")
  File ".../node.py", line 115, in _get_node_groups_scw
    instance_types = instance_api.list_servers_types().servers
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/scaleway/instance/v1/api.py", line 319, in list_servers_types
    return unmarshal_ListServersTypesResponse(res.json())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/scaleway/instance/v1/marshalling.py", line 2216, in unmarshal_ListServersTypesResponse
    {key: unmarshal_ServerType(value) for key, value in field.items()}
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../.venv/lib/python3.12/site-packages/scaleway/instance/v1/marshalling.py", line 2198, in unmarshal_ServerType
    return ServerType(**args)
           ^^^^^^^^^^^^^^^^^^
TypeError: ServerType.__init__() missing 1 required positional argument: 'baremetal'

This PR tries to address this issue by setting baremetal to False if it is missing.

[remyleone]

Hello, the file is generated, your PR will be overwritten :

# This file was automatically generated. DO NOT EDIT.
# If you have any remark or suggestion do not hesitate to open an issue.

We will investigate shortly

[bprus]

You're right, I missed the comment 🤦
If there's any way I can assist you, please let me know.