ci: adding support for python 3.13

Author: drgroot

.github/workflows/unittests.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.11", "3.12", "3.13"]
 
     services:
       rabbitmq: