Remove numpy array warning filter from ddlpy pyproject.toml

[veenstrajelmer]

Warning filter implemented in pyproject.toml in #191 to suppress RuntimeWarning: numpy.ndarray size changed, may indicate binary incompatibility. Expected 16 from C header, got 96 ... in tests/test_utils.py::test_dataframe_to_xarray_to_netcdf.

The filter is now added in netCDF4: reported in Unidata/netcdf4-python#1354 (comment) and implemented in Unidata/netcdf4-python#1471 on 23 Feb 2026.

Todo:

• await netCDF4 release (>1.7.4, after 23 feb 2026)
• remove warning filter
• maybe require updating the minimal required netcdf4 version
• see if tests still pass