update github actions

Author: roland-lenain

.github/workflows/python-package.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           mpi: ${{ matrix.mpi }}
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies