Features/#762 too many deprecation warnings

[CarlosEpia]

This PR solves the issue #762. It can be merged once all these different deprecation warnings are addressed:

• /home/carlos/env/etrago_624/lib/python3.10/site-packages/sklearn/base.py:486: UserWarning: X has feature names, but KMeans was fitted without feature names
  warnings.warn(
• /home/carlos/env/etrago_624/lib/python3.10/site-packages/pypsa/clustering/spatial.py:255: FutureWarning: The provided callable <function min at 0x70a2744d0ee0> is currently using SeriesGroupBy.min. In a future version of pandas, the provided callable will be used directly. To keep current behavior pass the string "min" instead.
  aggregated = df.groupby(grouper).agg(static_strategies)
• /home/carlos/git/eTraGo/etrago/cluster/spatial.py:278: FutureWarning: DataFrame.groupby with axis=1 is deprecated. Do frame.T.groupby(...) without axis instead.
  pnl_df = df_agg.groupby(grouper, axis=1).sum()
• /home/carlos/git/eTraGo/etrago/tools/utilities.py:290: FutureWarning: The geopandas.dataset module is deprecated and will be removed in GeoPandas 1.0. You can get the original 'naturalearth_lowres' data from https://www.naturalearthdata.com/downloads/110m-cultural-vectors/.
  path = gpd.datasets.get_path("naturalearth_lowres")