style: minor code style improvements in core modules

fastapi_traffic/middleware.py

@@ -3,18 +3,24 @@
 from __future__ import annotations
 
 import logging
-from typing import TYPE_CHECKING, Awaitable, Callable
+from typing import TYPE_CHECKING
 
 from starlette.middleware.base import BaseHTTPMiddleware
 from starlette.responses import JSONResponse
 
 from fastapi_traffic.backends.memory import MemoryBackend
 from fastapi_traffic.core.algorithms import Algorithm
-from fastapi_traffic.core.config import GlobalConfig, RateLimitConfig, default_key_extractor
+from fastapi_traffic.core.config import (
+    GlobalConfig,
+    RateLimitConfig,
+    default_key_extractor,
+)
 from fastapi_traffic.core.limiter import RateLimiter
 from fastapi_traffic.exceptions import RateLimitExceeded
 
 if TYPE_CHECKING:
+    from collections.abc import Awaitable, Callable
+
     from starlette.requests import Request
     from starlette.responses import Response
     from starlette.types import ASGIApp