Test agains 3.13.0-rc.3 until GitHub action is updated

Author: jg-rp

.github/workflows/tests.yaml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13.0-rc.3"]
         exclude:
           - os: macos-latest
             python-version: "3.7"