test: add Python 3.14 to the CI matrix

Author: vprivat-ads

.github/workflows/tests.yml

@@ -17,8 +17,9 @@ jobs:
           - { python: "3.11", os: "ubuntu-latest" }
           - { python: "3.12", os: "ubuntu-latest" }
           - { python: "3.13", os: "ubuntu-latest" }
-          - { python: "3.13", os: "windows-latest" }
-          - { python: "3.13", os: "macos-latest" }
+          - { python: "3.14", os: "ubuntu-latest" }
+          - { python: "3.14", os: "windows-latest" }
+          - { python: "3.14", os: "macos-latest" }
     steps:
       - name: Check out the repository
         uses: actions/checkout@v6