make pipeline work with 3.13

Author: ciur

.github/workflows/publish-to-pypi.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v3
       with:
-        python-version: '3.x'
+        python-version: '3.13'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip