use latest python version

.github/workflows/build-and-release.yml

@@ -8,10 +8,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Set up Python 3.8
+    - name: Set up Python
       uses: actions/setup-python@v1
-      with:
-        python-version: 3.8
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip