Temporary: fix CI and dependency "compatibility"

[KukovecRok]

@firefly-cpp This is only a temporary fix!

There are multiple problems here that need to be addressed (see CI log for details). I'll give a brief explanation:

1. AttributeError: module 'pkgutil' has no attribute 'ImpImporter' is removed in Python >= 3.12
2. Older versions of setuptools still reference ImpImporter
3. Older NumPy versions: pip tried to build from source instead of using a wheel, causing error
4. ModuleNotFoundError: No module named 'pkg_resources'; pkg_resources is deprecated as an API

The real problematic dependency here is:
geotiler 0.15.1, which has not been updated for 2 years. I've "fixed" pipeline, reducing setuptools to <70, which supports "legacy" behavior.
Pipeline is currently succesful on e.g. "platform linux -- Python 3.12.3, pytest-7.4.4, pluggy-1.5.0"

TLDR; we have mixed dependencies, modern (e.g. NumPy > 2.0.0) and legacy (geotiler).

This needs a longterm fix (replacing/forking/contributing to geotiler, updating NumPy API, ...)

[firefly-cpp]

Thanks! The only logical decision is to abandon the geotiler as soon as possible.