add python version test matrix

Author: SimonBlanke

.github/workflows/test.yml

@@ -93,14 +93,15 @@ jobs:
       fail-fast: false
       matrix:
         sklearn-version: ["1.5", "1.6", "1.7"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Python 3.12
         uses: actions/setup-python@v5
         with:
-          python-version: "3.12"
+          python-version: ${{ matrix.python-version }}
 
       - name: Install dependencies for scikit-learn ${{ matrix.sklearn-version }}
         run: |