add py 3.13

Author: ianscrivener

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.11", "3.12", "3.13"]
         os: [ubuntu-22.04]  # windows-latest , macos-latest
     runs-on: ${{ matrix.os }}
     steps: