drop python3.9

Author: avaldebe

.github/workflows/test.yml

@@ -14,11 +14,11 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: 3.10
+          python-version: '3.10'
       - name: Install uv
         uses: astral-sh/setup-uv@v7
         with:
-          python-version: 3.10
+          python-version: '3.10'
       - name: Run linters
         run: uvx --with tox-uv tox r -e lint
       - name: Build docs