Reduce Python test matrix to 3.8 and 3.13 versions

Co-authored-by: nicoragne <nicoragne@hotmail.fr>

Author: cursoragent

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.8", "3.13"]
         include:
           - os: ubuntu-latest
             python-version: "3.13"