Add 3.13, remove 3.9

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
   build:
     strategy:
       matrix:
-        python_version: ["3.9", 3.9-slim, "3.10", 3.10-slim, "3.11", 3.11-slim, "3.12", 3.12-slim, "3", 3-slim]
+        python_version: ["3.10", 3.10-slim, "3.11", 3.11-slim, "3.12", 3.12-slim, "3.13", 3.13-slim, "3", 3-slim]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code