Big improvements here are:

• template.Template.render now returns SafeText instead of Any.
• DjangoDivFormRenderer and Jinja2DivFormRenderer in forms.renderers.
• A template.backends.base._BaseTemplate protocol class that imitates the abstract BaseTemplate class from DEP 182. This is needed because there is no real parent class from which each template backend inherits from, they implement their own Template classes from scratch. So, BaseEngine needed a return type for its abstract methods, which is what _BaseTemplate provides.

Other changes include reducing repetition, adding more specific Template types for the different backends, using more generic Mapping type instead of dict for template contexts.