import syntax and ckanserviceprovider version

[categulario]

Hi everyone, it's me again!

So I was trying to build and run the container for datapusher-plus and it failed in two ways:

• first it complained at run time about the import syntax for the internal config module from main. Indeed: config is not a globally registered module and therefore cannot be imported as config unless $CWD is datapusher, which I suspect most of the time is not. This PR fixes that. The fix assumes that this is installed as a python package, probably via pip install -e or similar, which is what the readme says anyways. I'm actually wondering how this worked to begin with.
• then it complained about some flask import that doesn't exist in the package flask-login. It turns out this is related to the release of flask 3 and it is fixed in ckanserviceprovider 1.2.0 (see ckan/ckan-service-provider@b467d44).

Thanks!

[categulario]

This fixes #76