Python versions: remove obsolete 3.9 and add new 3.14

Author: howetuft

.github/workflows/wheel-builder.yml

@@ -58,7 +58,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-minor: [9, 10, 11, 12, 13]
+        python-minor: [10, 11, 12, 13, 14]
         os: [ubuntu-latest, windows-latest, macos-15-intel, macos-15]
     env:
       # Reminder: report all variables here to CIBW_ENVIRONMENT_PASS_LINUX