Update dehydrated

The bundled version of dehydrated is showing it's age ...

"detail": "Error creating new authz :: Validations for new domains are disabled in the V1 API (https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430)",

There is no new tagged version unfortunately 0.6.5 is still the latest ... but the master branch has the needed update.

I intend to update it to https://github.com/dehydrated-io/dehydrated/commit/dc552c602eca94737b66e...