* updates Django to 4.x and other packages (if possible) to latest versions
* Attention: Requires postgresql >= 12.0
* updates code fragments to match requirements of newer package versions
* adds clamping of 3D geometries to 2D geometries if uploaded using the map importer
* extends tests for payment-document linkage
* fixes bug in team-admin selection where autocomplete could not be resolved properly
* refactors konova/autocompletes.py by splitting into individual files and moving them to fitting apps
* autocomplete files now live in APPNAME/autocomplete/...
