Fixed linting issues.

Author: RobertSamoilescu

mlserver/rest/app.py

@@ -12,7 +12,6 @@
 from .requests import Request
 from .responses import Response
 from .errors import _EXCEPTION_HANDLERS
-from .logging import logger
 
 from ..settings import Settings
 from ..handlers import DataPlane, ModelRepositoryHandlers

mlserver/settings.py

@@ -6,7 +6,6 @@
 
 from typing import Any, Dict, List, Optional, Type, Union, no_type_check, TYPE_CHECKING
 from pydantic import (
-    root_validator,
     PyObject,
     Extra,
     Field,