Resolve dependency on custom osm-python-tools package

[Simon-Will]

For interacting with Nominatim and Overpass, we use the package OSMPythonTools, but we made some changes that have not been merged into the upstream. See if we can get them merged; otherwise we will need to fork the package.

[Simon-Will]

As of the new version of OSMPythonTools (0.3.2), the necessary changes are present in the library, so we can upgrade the dependency and this is resolved.