Bump weasyprint from 52.5 to 68.0 in /docs (geosolutions-it#11893)

Bumps [weasyprint](https://github.com/Kozea/WeasyPrint) from 52.5 to 68.0.
- [Release notes](https://github.com/Kozea/WeasyPrint/releases)
- [Changelog](https://github.com/Kozea/WeasyPrint/blob/main/docs/changelog.rst)
- [Commits](Kozea/WeasyPrint@v52.5...v68.0)

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

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Author: dependabot[bot]

docs/requirements.txt

@@ -2,6 +2,6 @@ mkdocs==1.5.2
 mkdocs-material==9.2.6
 jinja2==3.1.6
 Markdown==3.4.4
-WeasyPrint==52.5
+WeasyPrint==68.0
 mkdocs-with-pdf==0.9.3
 mkdocs-kroki-plugin==0.9.0