Add setuptools to combat Gym/distutils failure

.github/workflows/install-from-pypi.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install numpy
+        pip install setuptools numpy
     - name: Install from PyPI
       run: |
         pip install mdp-playground