ci - drop python3.9

Author: commonism

.github/workflows/codecov.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
     env:
       OS: ${{ matrix.os }}
       PYTHON: ${{ matrix.python-version }}