style: sort imports in schemas

gns3server/schemas/controller/images.py

@@ -14,11 +14,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from pydantic import ConfigDict, BaseModel, Field
 from enum import Enum
 from datetime import datetime
 from typing import Optional, Literal
 
+from pydantic import BaseModel, ConfigDict, Field
+
 from .base import DateTimeModelMixin