remove unused import

Author: galkleinman

packages/opentelemetry-instrumentation-langchain/tests/test_tool_call_content.py

@@ -6,7 +6,6 @@
 attributes were missing for assistant messages that contained tool_calls.
 """
 
-import pytest
 from unittest.mock import Mock
 from langchain_core.messages import AIMessage, HumanMessage, ToolMessage
 from opentelemetry.instrumentation.langchain.span_utils import set_chat_request