fix: remove unused imports to resolve lint issues

- Remove unused 'os' import from reproduce_issue_3317.py
- Remove unused 'pytest' import from tests/test_bedrock_stop_sequence_fix.py
- Verified locally with ruff that all lint issues are resolved

Co-Authored-By: João <joao@crewai.com>

reproduce_issue_3317.py

@@ -4,7 +4,6 @@ Reproduction script for issue #3317
 CrewAI injects stop sequences causing Bedrock GPT-OSS 400 errors
 """
 
-import os
 from crewai import Agent, Task, Crew
 from crewai.llm import LLM
 

tests/test_bedrock_stop_sequence_fix.py

@@ -1,4 +1,3 @@
-import pytest
 from unittest.mock import Mock, patch
 from crewai.agents.crew_agent_executor import CrewAgentExecutor
 from crewai.llm import LLM