fix unused import

Author: Lms24

packages/core/src/basebackend.ts

@@ -1,5 +1,5 @@
 import { Event, EventHint, Options, Session, Severity, Transport } from '@sentry/types';
-import { logger, SentryError } from '@sentry/utils';
+import { logger } from '@sentry/utils';
 
 import { initAPIDetails } from './api';
 import { IS_DEBUG_BUILD } from './flags';