Update requirements.txt to include scipy and wkhtmltopdf

- Added scipy for scientific computing capabilities and wkhtmltopdf for improved PDF generation support.
- This update enhances the application's functionality related to data processing and PDF export.

requirements.txt

@@ -6,4 +6,5 @@ pdfkit
 pulp
 docker
 plotly
-scipy
+scipy
+wkhtmltopdf