style: sort imports in schemas

gns3server/schemas/controller/links.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 BaseModel, Field, field_validator
-from typing import List, Optional, Tuple
 from enum import Enum
+from typing import List, Optional, Tuple
 from uuid import UUID, uuid4
 
+from pydantic import BaseModel, Field, field_validator
+
 from .labels import Label