Updates for Jinja2 >= 3.1.x

[raffienficiaud]

• importing Markup from MarkupSafe
• replacing evalcontextfilter by pass_eval_context
• making the dependency explicit

[raffienficiaud]

Note: this may conflict with #74 but I can make my code work together with the trick in #73

[raffienficiaud]

This work is being superseded by this PR: https://github.com/raffienficiaud/secretary/pull/1