GitHub Actions: Add Python 3.12 and 3.13 to the testing

Author: cclauss

.github/workflows/push.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
         os: [ubuntu-latest, macOs-latest]
     steps:
     - name: Checkout python-for-android