Update pdfly/extract_annotated_pages.py

Seems that the `| None` syntax is not valid with Python 3.8

Co-authored-by: Lucas Cimon <[email protected]>

Author: wolfram77

pdfly/extract_annotated_pages.py

@@ -15,7 +15,7 @@ def is_manipulable(annot) -> bool:
 
 
 # Main function.
-def main(input_pdf: Path, output_pdf: Path | None) -> None:
+def main(input_pdf: Path, output_pdf: Optional[Path]) -> None:
     if not output_pdf:
         output_pdf = input_pdf.with_name(input_pdf.stem + "_annotated.pdf")
     input = PdfReader(input_pdf)