CI: run tests against the 2025.12 revision

Update ARRAY_API_TESTS_VERSION to 2025.12

Author: ev-br

.github/workflows/array-api-tests.yml

@@ -84,7 +84,7 @@ jobs:
     - name: Run the array API testsuite (${{ inputs.package-name }})
       env:
         ARRAY_API_TESTS_MODULE: array_api_compat.${{ inputs.module-name || inputs.package-name }}
-        ARRAY_API_TESTS_VERSION: 2024.12
+        ARRAY_API_TESTS_VERSION: 2025.12
         # This enables the NEP 50 type promotion behavior (without it a lot of
         # tests fail on bad scalar type promotion behavior)
         NPY_PROMOTION_STATE: weak