avoid testing on python 3.13 since the postgres dependency is not yet available

Author: pattonw

.github/workflows/tests.yaml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     env:
        PGUSER: postgres