Use python3.13 in workflows

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

@@ -15,7 +15,7 @@ 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

.github/workflows/tests.yml

@@ -7,21 +7,21 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v4
         with:
-          python-version: "3.11"
+          python-version: "3.13"
       - uses: pre-commit/[email protected]
 
   unit-tests:
     needs: pre-commit
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - name: Set up Python 3.11
+      - name: Set up Python 3.13
         uses: actions/setup-python@v4
         with:
-          python-version: "3.11"
+          python-version: "3.13"
       - name: Run Tests
         run: |
           python -m pip install --upgrade pip