Fix: Sort imports in test file to fix lint error

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

tests/knowledge/test_knowledge_source_instantiation.py

@@ -1,6 +1,7 @@
-from pathlib import Path
 import pytest
+from pathlib import Path
 from unittest.mock import patch
+
 from crewai.knowledge.source.pdf_knowledge_source import PDFKnowledgeSource
 
 @patch('crewai.knowledge.source.base_file_knowledge_source.BaseFileKnowledgeSource.validate_content')