Add CI actions using Python 3.13

.github/workflows/python-package.yml

@@ -95,5 +95,34 @@ jobs:
         run: |
           pytest --cov=deferrer --cov-report=xml --cov-append
 
+      - name: Set up latest Python (latest 3.13)
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install dependencies (latest 3.13)
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade pytest pytest-cov
+
+      - name: Test with pytest (latest 3.13)
+        run: |
+          pytest --cov=deferrer --cov-report=xml --cov-append
+
+      - name: Set up Python 3.13.0 (3.13.0)
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13.0"
+
+      - name: Install dependencies (3.13.0)
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade pytest pytest-cov
+
+      - name: Test with pytest (3.13.0)
+        if: ${{ ! startsWith(matrix.os, 'macos') }}
+        run: |
+          pytest --cov=deferrer --cov-report=xml --cov-append
+
       - name: Coveralls      
         uses: coverallsapp/github-action@v2.3.0