Test on Python 3.13 development releases

Author: jarrodmillman

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
       matrix:
         os: [ubuntu, macos, windows]
         python-version:
-          ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.8", "pypy-3.9"]
+          ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev", "pypy-3.8", "pypy-3.9"]
 
     steps:
       - uses: actions/checkout@v4