Fix lint and type-checker issues in OAuth2 implementation

- Remove unused imports (List, Optional, MagicMock)
- Fix type annotation: change 'any' to 'Any' in oauth2_token_manager.py
- All OAuth2 tests still pass after fixes

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

src/crewai/llms/oauth2_config.py

@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import Dict, List, Optional
+from typing import Dict, Optional
 import json
 from pydantic import BaseModel, Field
 

src/crewai/llms/oauth2_token_manager.py

@@ -1,6 +1,6 @@
 import time
 import requests
-from typing import Dict, Optional
+from typing import Dict, Any
 from .oauth2_config import OAuth2Config
 
 
@@ -19,7 +19,7 @@ class OAuth2TokenManager:
         
         return self._acquire_new_token(config)
     
-    def _is_token_valid(self, token_data: Dict[str, any]) -> bool:
+    def _is_token_valid(self, token_data: Dict[str, Any]) -> bool:
         """Check if token is still valid (not expired)"""
         if "expires_at" not in token_data:
             return False

tests/test_oauth2_llm.py

@@ -4,7 +4,7 @@ import requests
 import tempfile
 import time
 from pathlib import Path
-from unittest.mock import Mock, patch, MagicMock
+from unittest.mock import Mock, patch
 from crewai.llm import LLM
 from crewai.llms.oauth2_config import OAuth2Config, OAuth2ConfigLoader
 from crewai.llms.oauth2_token_manager import OAuth2TokenManager