Bump weasyprint from 65.1 to 68.0 in /requirements

Bumps [weasyprint](https://github.com/Kozea/WeasyPrint) from 65.1 to 68.0.
- [Release notes](https://github.com/Kozea/WeasyPrint/releases)
- [Changelog](https://github.com/Kozea/WeasyPrint/blob/main/docs/changelog.rst)
- [Commits](https://github.com/Kozea/WeasyPrint/compare/v65.1...v68.0)

---
updated-dependencies:
- dependency-name: weasyprint
  dependency-version: '68.0'
  dependency-type: direct:production
...

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

requirements/requirements.txt

@@ -16,7 +16,7 @@ python-magic==0.4.27
 PyYAML==6.0.2
 requests==2.32.4
 uritemplate==4.1.1
-weasyprint==65.1
+weasyprint==68.0
 XlsxWriter==3.2.3
 Django==5.2.2
 django-admin-autocomplete-filter==0.7.1