fix ruff findings

Author: lannuttia

instrumentation/opentelemetry-instrumentation-fastapi/src/opentelemetry/instrumentation/fastapi/__init__.py

@@ -191,11 +191,9 @@ def client_response_hook(span: Span, scope: dict[str, Any], message: dict[str, A
 import fastapi
 from starlette.applications import Starlette
 from starlette.middleware.errors import ServerErrorMiddleware
-
 from starlette.routing import Match, Route
 from starlette.types import ASGIApp, Receive, Scope, Send
 
-
 from opentelemetry.instrumentation._semconv import (
     _get_schema_url,
     _OpenTelemetrySemanticConventionStability,