Modernize dependencies and CI, add Python 3.13 support, fix NumPy 2

[suriyahgit]

Backport changes from openeo-processes-dask PR Open-EO#372:

• Bump python to >=3.10,<3.14, add py3.13 classifier
• Allow numpy >=1.26.3,<3; pystac >=1.8.0
• Remove upper bounds from xarray, dask, geopandas, dask-geopandas, xgboost
• Switch CI to conda-incubator/setup-miniconda, Poetry 2.3.3, actions/checkout@v6
• Replace np.obj2sctype and np.issubsctype for NumPy 2 compat
• Fix array_find (filled arrays, no warning), array_interpolate_linear (lazy dask)
• Fix random_forest xgboost import (dxgb), resample tie handling, zero-size dim check
• Update tests: model_validate, new array_find/interpolate/ml tests

Additonal fixes that are relevant to executor modernisation related to DEDL Project

• zarr v3 support added with backward compatibility to zarr v2

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