Update Python version in CI workflow from 3.13 to 3.12

Author: PierreRaybaut

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.13"]
+        python-version: ["3.9", "3.12"]
 
     steps:
     - uses: actions/checkout@v4