Run tests on Python 3.13 (#62)

Author: vrslev

.github/workflows/test.yml

@@ -43,6 +43,7 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
+          - "3.13"
     steps:
       - uses: actions/checkout@v4
       - uses: extractions/setup-just@v2