Upgrade tested Python versions.

Author: stefanseefeld

.github/workflows/test-windows.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7]
+        python-version: ['3.8', '3.9', '3.10']
 
     steps:
     - uses: actions/checkout@v5