fixed workflow

.gitea/workflows/tests.yaml

@@ -10,6 +10,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/setup-python@v5
+        with:
+          python-version: '3.13.1'
       - name: Installing dependencies
         run: python -m pip install unittest
       - name: Test with unittest