Investigate Python 3.13 support

[veenstrajelmer]

What is the need for this task.
Python 3.13 was released on 1 October 2024, let's see if the testbanks pass.

What is the task?

• add py3.13 to ci
• release lxml upper bound since installation failed
• installation failed on pandas error (which is not a dependency, but it comes from xarray). It fails because pandas 2.0.3 is being installed, while 2.2.3 is the first version that can be installed on python 3.13 >> add python-version-dependent pandas dependency to please poetry
• upon installation of netCDF4: ValueError: did not find HDF5 headers >> New post release to create Python 3.13 wheels Unidata/netcdf4-python#1370
• Drop Python 3.8 support #709
• numpy<2 does not support python 3.13 yet, so this requirement has to be released: Investigate numpy 2.0.0 support #657
• win 10 Python-3.13.0 tkinter fails in venv python/cpython#125235 >> will be fixed in python 3.13.1 (December 2024)
• if green, add py3.13 to pyproject.toml