[workflow] remove 3.8, add 3.13

Author: jgrewe

.github/workflows/pythonpackage.yml

@@ -19,7 +19,7 @@ jobs:
       max-parallel: 4
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v2