Remove python 3.13-dev, as it's not available yet

Author: youtux

.github/workflows/main.yml

@@ -31,10 +31,6 @@ jobs:
             toxfactor: py3.12
             ignore-typecheck-outcome: true
             ignore-test-outcome: false
-          - python-version: "3.13-dev"
-            toxfactor: py3.13
-            ignore-typecheck-outcome: true
-            ignore-test-outcome: false
 
     steps:
     - uses: actions/checkout@v3