Update pythonpackage.yml

.github/workflows/pythonpackage.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install 'setuptools==71.1.0'
+        pip install 'setuptools==69.5.1'
         python -m pip show setuptools
         pip install .
     - name: Lint with flake8