Fix lint issues: remove unused imports

- Remove unused 'os' import from reproduce_issue.py
- Remove unused imports (os, Agent, Crew, Task) from test_mem0_storage.py
- Addresses lint check failure in CI

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

reproduce_issue.py

@@ -3,7 +3,6 @@ Reproduction script for issue #3152 - mem0 external memory format error
 Based on the code provided in the GitHub issue
 """
 
-import os
 from crewai import Agent, Task, Crew
 from crewai.memory.external.external_memory import ExternalMemory
 

tests/storage/test_mem0_storage.py

@@ -1,14 +1,10 @@
-import os
 from unittest.mock import MagicMock, patch
 
 import pytest
 from mem0.client.main import MemoryClient
 from mem0.memory.main import Memory
 
-from crewai.agent import Agent
-from crewai.crew import Crew
 from crewai.memory.storage.mem0_storage import Mem0Storage
-from crewai.task import Task
 
 
 # Define the class (if not already defined)