CI: add python 3.14

Author: ev-br

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.12", "3.13"]
+        python-version: ["3.12", "3.13", "3.14"]
 
     steps:
     - name: Checkout array-api-tests