bump python version

Author: GreggArcher

.github/workflows/jupyterlite.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.12'
 
       # 1) Install JupyterLite core (with contents indexer) + Pyodide kernel
       # Pin to the same 0.6.x line to avoid runtime mismatches.