Update markupsafe requirement from <2.0.0 to <3.0.0

Updates the requirements on [markupsafe](https://github.com/pallets/markupsafe) to permit the latest version.
- [Release notes](https://github.com/pallets/markupsafe/releases)
- [Changelog](https://github.com/pallets/markupsafe/blob/main/CHANGES.rst)
- [Commits](pallets/markupsafe@0.9...2.0.1)

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

requirements.txt

@@ -1,5 +1,7 @@
 click>=7.1.2
 docutils>=0.16
 domdf-python-tools>=2.0.0
+jinja2<3.0.0
+markupsafe<3.0.0
 sphinx<4.0,>=1.5
 sphinx-toolbox>=1.7.2