👷 Update Python version for coverage (#1083)

Author: tiangolo

.github/workflows/test.yml

@@ -86,7 +86,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.12'
 
       - name: Get coverage files
         uses: actions/download-artifact@v4