Fix UnicodeDecodeError in litellm when loading JSON files on Windows

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

tests/litellm_tests/test_encoding.py

@@ -0,0 +1,27 @@
+import json
+import os
+import sys
+import unittest
+from unittest.mock import patch, mock_open
+
+import pytest
+
+from crewai.llm import LLM
+
+
+class TestLitellmEncoding(unittest.TestCase):
+    """Test that the litellm encoding patch works correctly."""
+
+    def test_json_load_with_utf8_encoding(self):
+        """Test that json.load is called with UTF-8 encoding."""
+        
+        mock_content = '{"test": "日本語テキスト"}'  # Japanese text that would fail with cp1252
+        
+        with patch('builtins.open', mock_open(read_data=mock_content)):
+            import litellm
+            
+            self.assertTrue(hasattr(litellm.utils, 'json_data'))
+            
+            with open('test.json', 'r') as f:
+                data = json.load(f)
+                self.assertEqual(data['test'], '日本語テキスト')