fix: requirements-doc.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-6150717

requirements-doc.txt

@@ -4,7 +4,7 @@
 # (see 'docs/conf.py')
 astroid<2.12    # pin to resolve sphinx-autoapi (see https://github.com/readthedocs/sphinx-autoapi/issues/349)
 cloud_sptheme
-jinja2<3.1  # fix sphinx failing, see: https://github.com/sphinx-doc/sphinx/issues/10291
+jinja2<3.1.3  # fix sphinx failing, see: https://github.com/sphinx-doc/sphinx/issues/10291
 pycodestyle>=2.6.0,<2.9.0; python_version <= "3.5"  # pyup: ignore
 pycodestyle>=2.6.0,<3; python_version >= "3.6"
 # sphinx-autoapi dropped 3.5 support at 1.3.0