Update actions/setup-python (#52)

Author: fabaff

.github/workflows/pythonpackage.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5.3.0
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies