Drop testing on 3.9, test on 3.14

Author: simonw

.github/workflows/test.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}