Remove PyPy 3.9 from workflow matrix

pypy 3.9 is not supported anymore

Author: auvipy

.github/workflows/main.yml

@@ -26,7 +26,6 @@ jobs:
           - "3.12"
           - "3.13"
           - "3.14"
-          - "pypy3.9"
           - "pypy3.10"
           - "pypy3.11"