CI: Add Python3.14 to default testing workflow.

Author: rossbar

.github/workflows/test.yml

@@ -78,7 +78,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu]
-        python-version: ["3.11", "3.12", "3.13"]
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@v5