update: test workflow

Author: GefMar

.github/workflows/test.yml

@@ -34,6 +34,9 @@ jobs:
       - uses: actions/checkout@v5
         with:
           persist-credentials: false
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.py_version }}
       - id: setup-uv
         uses: astral-sh/setup-uv@v7
         with: