Fix imports

src/blueapi/core/event.py

@@ -1,6 +1,5 @@
 import itertools
 from abc import ABC, abstractmethod
-from copy import copy
 from typing import Callable, Dict, Generic, Optional, TypeVar
 
 #: Event type

src/blueapi/worker/task.py

@@ -1,6 +1,5 @@
 import logging
 from abc import ABC, abstractmethod
-from dataclasses import dataclass
 from typing import Any, Mapping
 
 from pydantic import BaseModel, Field, parse_obj_as

tests/service/test_rest_api.py

@@ -1,12 +1,10 @@
-import itertools
 from dataclasses import dataclass
 
 from fastapi.testclient import TestClient
 from pydantic import BaseModel
 
 from blueapi.core.bluesky_types import Plan
 from blueapi.service.handler import Handler
-from blueapi.service.model import TaskResponse
 from blueapi.worker.task import RunPlan, Task