Update PDF to Markdown converter API with NVIDIA L4 support

pdf_converter/convert_pdf_to_md.py

@@ -20,8 +20,11 @@ def convert_pdf(pdf_input_path, output_md_path=None):
     print(f"Starting conversion of '{pdf_input_path}'...")
 
     try:
+        # Use marker.Marker() for newer versions of marker-pdf
+        md_converter = marker.Marker()
+        
         # Convert the PDF to markdown using marker
-        markdown_text, _ = marker.convert(pdf_input_path)
+        markdown_text = md_converter.convert_file(pdf_input_path)
         
         # If output path is provided, save the markdown
         if output_md_path: