Update python versions in tests

Add up to and including 3.13

Author: ponyisi

.github/workflows/ci.yaml

@@ -13,7 +13,7 @@ jobs:
   test:
     strategy:
       matrix:
-        python-version: ['3.7','3.8','3.9','3.10']
+        python-version: ['3.7','3.8','3.9','3.10','3.11','3.12','3.13']
     runs-on: ubuntu-latest
 
     steps: