Remove fixed MarkupSafe version when Jinja2 bug is fixed

[TiBiBa]

This is a placeholder to ensure that we don't forget to remove the fixed MarkupSafe version 2.0.1 when the unittests breaking Jinja2 bug is solved. We should keep an eye out for the corresponding Jinja2 issue and remove the fixed version as soon as that one is solved an Jinja2 is updated within our project.

Related issue: pallets/jinja#1587

[davidism]

You are using an unsupported version of Jinja, please update to the latest version if possible. Additionally, please read https://hynek.me/articles/semver-will-not-save-you/, then use a tool like pip-tools to pin your dependencies and control when you get updates. Be sure to run your tests with deprecation warnings treated as errors so that you get notified of these types of changes early.