Update build.yml

Author: cicirello

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v3
       with:
-        python-version: '3.8'
+        python-version: '3.10'
 
     - name: Run Python unit tests
       run: python3 -u -m unittest tests/tests.py