Improve environment.yaml (PyPSA#3)

* avoid pip
* remove xarray constraint
* add pyam for ariadne data retrieval (needs USERNAME!)

Author: Micha

environment.yaml

@@ -29,7 +29,7 @@ dependencies:
 - geopandas>=0.11.0
 - atlite>=0.2.9
 - dask
-- xarray<=2023.8.0
+- xarray
 - rioxarray
 - netcdf4
 - networkx
@@ -48,6 +48,10 @@ dependencies:
 - tabula-py
 - pyxlsb
 - graphviz
+- tsam>=1.1.0
+- pypsa>=0.25.1
+- highs
+- pyam
 
   # Keep in conda environment when calling ipython
 - ipython
@@ -58,7 +62,4 @@ dependencies:
 - rasterio!=1.2.10
 
 
-- pip:
-  - tsam>=1.1.0
-  - pypsa>=0.25.1
-  - highspy
+