[BUG] Relax itables version to >= 2.4.0

**Describe the bug**

`graph-notebook==5.2.0` pins `itables>=2.0.0,<=2.1.0` in `pyproject.toml`. This upper bound predates `itables 2.4.0`, in which HTML content in DataFrame cells is escaped by default (fix: [mwouts/itables#346](https://github.com/mwouts/itables/issues/346)). In `itables<=2.1.0`, cell contents are passed verbatim to DataTables and rendered as live HTML/JS.

graph-notebook itself is not affected afaik, but it would be nice to relax itables version to avoid installing a vulnerable dependency

**Environment**
- OS: Ubuntu 24.04
- Browser: Google Chrome
- graph-notebook: 5.2.0

**To Reproduce**
In a fresh JupyterLab environment with `graph-notebook==5.2.0` installed (which pulls `itables==2.1.0`), run:
```python
import pandas as pd
from itables import show
results_df = pd.DataFrame({
"id": [1, 2, 3],
"name": [
"alice",
"bob",
'\\"alert(\'random text\')',
],
})
show(results_df)
```

**Expected behavior**

No live html rendered

Start in pyproject.toml, where graph-notebook pins the itables dependency. Verify that the constraint permits itables 2.4.0 or newer, install graph-notebook in a clean JupyterLab environment, and confirm the reported DataFrame example no longer renders live HTML.

Written by the indexing model from the issue text.