Update jinja2 requirement from ~=2.11 to >=2.11,<4.0

Updates the requirements on [jinja2](https://github.com/pallets/jinja) to permit the latest version.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.11.0...3.0.1)

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

setup.cfg

@@ -38,7 +38,7 @@ install_requires =
     WTForms~=2.2.1,<2.3  # See #567
     Flask~=1.1
     itsdangerous~=1.1
-    Jinja2~=2.11
+    Jinja2>=2.11,<4.0
     requests~=2.22
     SQLAlchemy-Continuum~=1.3
     SQLAlchemy~=1.3.0  # New 1.4 changes API, see #728