style: sort imports in schemas

gns3server/schemas/controller/snapshots.py

@@ -15,10 +15,11 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from pydantic import BaseModel, Field
 from typing import Optional
 from uuid import UUID
 
+from pydantic import BaseModel, Field
+
 
 class SnapshotBase(BaseModel):
     """