Drop support for Python 3.8, test 3.13-14 in CI

Author: darosior

.github/workflows/python-package.yml

@@ -10,7 +10,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        python-version: [3.8, 3.9, '3.10', 3.11, 3.12]
+        python-version: [3.9, '3.10', 3.11, 3.12, 3.13, 3.14]
         os:
           - ubuntu-latest
           - macos-13  # (non-M1)