rm 3.9 from testing

Author: tschaume

.github/workflows/testing.yml

@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.10", "3.11"]
 
     env:
       PMG_MAPI_KEY: ${{ secrets.PMG_MAPI_KEY }}