Bump Jinja2 to allow for Jinja2 3.x

[whardier]

We have projects that depend on Jinja that also use this project and we are planning on using 3.x. It's a mess.. I know..

Please review new Jinja2 3.x for inclusion into this project. Alternatively I can help provide patching to remove Jinja2 from this project or possibly set Jinja2 as an extra dep since it is not required.

[whardier]

#52

[mtkennerly]

Thanks for raising this concern. The timing here is kind of interesting:

• poetry-dynamic-versioning still supports Python 3.5,
• Jinja2 3.0.x no longer supports Python 3.5,
• Poetry 1.1.x still supports Python 3.5, but 1.2.x will no longer support it (and there's already a 1.2.0a1 available, so it may not be long).

Fortunately, Poetry does allow you to configure different dependency ranges based on environment markers, so this is manageable.

As part of Poetry 1.2.0, the official plugin system will become available as well (#39), and then PDV and its dependencies might be installed in such a way that they wouldn't conflict with your project's use of a different Jinja2 version anyway (although I'm not 100% sure on that). Still, in the meantime, I agree it's best to update this.

[mtkennerly]

This is now addressed in v0.13.0. Let me know if you run into any further issues with it.