Switch PageTemplates to use `zope.untrustedpython`.

[icemac]

trafficstars

I see no change in the tests and in behavior when testing in a TTW PageTemplate document with:

<span tal:content="python:f'{template.__class__}" />

Currently I am not sure that we need this change or could benefit from it.

[dataflake]

What exactly is the goal of this change?

[icemac]

What exactly is the goal of this change?

That's not yet clear. Possibly we do not need it because we have hooked up the page template engine in another way.

[loechel]

I do not see any dependency on that for Plone. As much as I love the idea of having TTW Page Templates secured, I am not sure how many people still use this and if that also works with chameleon.

Drop me a not if I should check some things after the merge of other packages.

[icemac]

Closing as not relevant for Zope 5.