Set python version to 3.13 for GH actions (#74)

Author: ryanhill1

.github/workflows/gh-pages.yml

@@ -42,7 +42,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.x'
+          python-version: 3.13
 
       - name: Install dependencies
         run: |