Test on Python 3.13 development releases (#210)

Author: jarrodmillman

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
   test_spin:
     strategy:
       matrix:
-        python_version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python_version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
         os: [ubuntu-latest, windows-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps: