Add Python 3.14 to CI

Author: mvdwetering

.github/workflows/push.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.13"]
+        python-version: ["3.13", "3.14"]
     steps:
       - uses: "actions/checkout@v4"
       - name: Set up Python ${{ matrix.python-version }}