reduces python versions for alpha testing

Author: chalmerlowe

.github/workflows/unittest.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: ['3.9', '3.10', "3.11", "3.12", "3.13"]
+        python: ["3.13"]
     steps:
     - name: Checkout
       uses: actions/checkout@v4