ci: drop Python 3.7 support, test on 3.11 and 3.12

Author: darosior

.github/workflows/python-package.yml

@@ -10,7 +10,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10']
+        python-version: [3.8, 3.9, '3.10', 3.11, 3.12]
         os:
           - ubuntu-latest
           - macos-13  # (non-M1)