Fix: take only span text not whole dictionary

src/sec_certs/utils/pdf.py

@@ -175,7 +175,7 @@ def segmented_pdf_to_text(segmented_pdf: list[dict[str, Any]]) -> str:
                     for line in block["lines"]:
                         spans = []
                         for span in line["spans"]:
-                            spans.append(span.strip())
+                            spans.append(span["text"].strip())
                         line = " ".join(spans)
                         if len(line.strip()) > 0:
                             lines.append(line)