drop support for python < 3.11

Author: rnovatorov

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python: ["3.11", "3.12", "3.13", "3.14"]
     steps:
       - name: Checkout
         uses: actions/checkout@v2