Update python version for Github actions

Author: cgarwood

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

@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - name: Set up Python 3.7
+      - name: Set up Python 3.13
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
+          python-version: 3.13
       - name: Install wheel
         run: >-
           pip install wheel