more ci warnings

.github/workflows/build_msp430.yml

@@ -16,9 +16,12 @@ jobs:
         family:
         # Alphabetical order
         - 'msp430'
+
     steps:
     - name: Setup Python
       uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
 
     - name: Checkout TinyUSB
       uses: actions/checkout@v3