Update Python versions in GitHub Actions workflow

Author: dfm

.github/workflows/tests.yml

@@ -16,12 +16,12 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.14"]
         os: ["ubuntu-latest"]
         include:
-          - python-version: "3.9"
+          - python-version: "3.13"
             os: "macos-latest"
-          - python-version: "3.9"
+          - python-version: "3.13"
             os: "windows-latest"
 
     steps:
@@ -56,7 +56,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.9"
+          python-version: "3.13"
       - name: Finish coverage collection
         run: |
           python -m pip install -U pip
@@ -74,7 +74,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v6
         with:
-          python-version: "3.9"
+          python-version: "3.13"
       - name: Install dependencies
         run: |
           python -m pip install -U pip
@@ -91,7 +91,7 @@ jobs:
       - uses: actions/setup-python@v6
         name: Install Python
         with:
-          python-version: "3.9"
+          python-version: "3.13"
       - name: Build sdist and wheel
         run: |
           python -m pip install -U pip