Update tests.yml

Author: mechmind-dwv

.github/workflows/tests.yml

@@ -9,7 +9,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v3
       with:
         python-version: '3.10'