add Python 3.13 to unit-test matrix (#128)

Author: devhawk

.github/workflows/unit-test.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
     services:
       # Postgres service container
       postgres: