add 3.14 to test matrix

Author: gadfort

.github/workflows/tests.yml

@@ -22,6 +22,7 @@ jobs:
           - {python: "3.11", os: "ubuntu-latest"}
           - {python: "3.12", os: "ubuntu-latest"}
           - {python: "3.13", os: "ubuntu-latest"}
+          - {python: "3.14", os: "ubuntu-latest"}
     steps:
       - uses: actions/checkout@v5
         with: