change python version for docs to 3.13

Author: Linchin

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.12"
+        python-version: "3.13"
     - name: Install nox
       run: |
         python -m pip install --upgrade setuptools pip wheel