Merge pull request #465 from OpenDataServices/python313

python: Add 3.13

Author: Bjwebb

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: [ '3.9', '3.10', '3.11', '3.12']
+        python-version: [ '3.9', '3.10', '3.11', '3.12', '3.13']
         jsonref-version: ["==0.3", ">1"]
     steps:
     - uses: actions/checkout@v2