Don't test to 3.9. Not supported

Author: caleb-johnson

.github/workflows/docs.yml

@@ -23,7 +23,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.10'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip

.github/workflows/test_development_versions.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.9]
+        python-version: [3.10]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}

.github/workflows/test_latest_versions.yml

@@ -20,7 +20,7 @@ jobs:
       max-parallel: 4
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         include:
           - os: macos-latest
             python-version: "3.12"