CI: use ndonnx wheels for python 3.13

Author: ev-br

.github/workflows/tests.yml

@@ -33,12 +33,8 @@ jobs:
           python -m pip install pytest
 
           # Don't `pip install .[dev]` as it would pull in the whole torch cuda stack
-          python -m pip install array-api-strict dask[array] jax[cpu] sparse
+          python -m pip install array-api-strict dask[array] jax[cpu] sparse ndonnx
           python -m pip install torch --index-url https://download.pytorch.org/whl/cpu
-          if [ "${{ matrix.python-version }}" != "3.13" ]; then
-            # onnx wheels are not available on Python 3.13 at the moment of writing
-            python -m pip install ndonnx
-          fi
 
           if [ "${{ matrix.numpy-version }}" == "dev" ]; then
             python -m pip install numpy --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple