fix: Remove unused imports

Author: sentrivana

sentry_sdk/_span_batcher.py

@@ -6,12 +6,11 @@
 from sentry_sdk._batcher import Batcher
 from sentry_sdk.consts import SPANSTATUS
 from sentry_sdk.envelope import Envelope, Item, PayloadRef
-from sentry_sdk.utils import format_timestamp, serialize_attribute, safe_repr
+from sentry_sdk.utils import format_timestamp, serialize_attribute
 
 if TYPE_CHECKING:
     from typing import Any, Callable, Optional
     from sentry_sdk.traces import StreamedSpan
-    from sentry_sdk._types import SerializedAttributeValue
 
 
 class SpanBatcher(Batcher["StreamedSpan"]):