Keep all previous Python versions in the test matrix

Author: apetenchea

.github/workflows/build.yaml

@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.8", "3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
 
     steps:
       - name: Checkout repository