Bump requests from 2.28.2 to 2.31.0

Bumps [requests](https://github.com/psf/requests) from 2.28.2 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.28.2...v2.31.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -133,7 +133,7 @@ reportlab==3.6.12
     #   rst2pdf (setup.py)
     #   svglib
     #   xhtml2pdf
-requests==2.28.2
+requests==2.31.0
     # via
     #   pyhanko
     #   pyhanko-certvalidator