Use Python 3.13 in CI and widen supported range

Bump setup-python to 3.13 in both workflows and update the project's
python constraint to >=3.9,<3.14 (drops EOL 3.8, allows 3.13).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: kolibril13

.github/workflows/JupyterLite.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.10'
+          python-version: '3.13'
       - name: Install the dependencies
         run: |
           python -m pip install -r .jupyterlite/requirements.txt

.github/workflows/pypi-publish.yml

@@ -15,10 +15,10 @@ jobs:
       with:
         submodules: recursive
 
-    - name: Set up Python 3.9
+    - name: Set up Python 3.13
       uses: actions/setup-python@v5
       with:
-        python-version: 3.9
+        python-version: '3.13'
 
     - name: Install poetry
       run: python -m pip install --upgrade poetry

pyproject.toml

@@ -8,7 +8,7 @@ readme = "README.md"
 include = ["vendor/compare_view/browser_compare_view.js"]
 
 [tool.poetry.dependencies]
-python = ">=3.8,<3.13"
+python = ">=3.9,<3.14"
 ipython = ">=6.0.0"
 ipykernel = ">=5.0.0"
 Pillow = ">=7.1.2"