Change the Python version in the GitHub Actions workflow to 3.13

Author: nickmoreton

.github/workflows/test.yml

@@ -22,10 +22,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Set up Python 3.12
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       - uses: pre-commit/action@v3.0.1
 
   test: