Update python version used in CI

Author: blowekamp

.github/workflows/main.yml

@@ -18,10 +18,10 @@ jobs:
       with:
          fetch-depth: 1
          submodules: true
-    - name: Set up Python 3.9
+    - name: Set up Python 3.11
       uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: 3.11
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
@@ -47,7 +47,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: ['3.8', '3.11']
+        python-version: ['3.9', '3.13']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/download-artifact@v3