[CHORE]: Fix jupyter deps issue

[emilykl]

Issue

There's a CI failure on main caused by the Jupyter Python dependencies used to build the Jupyterlab extension.

The ultimate failure seems to be caused by a recent change in jupyterlab-builder which doesn't properly account for the || specifier in package.json deps.

However, the reason we're hitting that pathway in the first place is due to this:

@jupyterlab/core-meta was not found in node_modules. This extension declares
a devDependency on @jupyterlab/builder@4.3.6 || ^3.6.8, which is a legacy package
so core-meta 4.3.6 || ^3.6.8 will be used instead of the latest release. 
To avoid this, add @jupyter/builder as a devDependency instead of @jupyterlab/builder.

Description of change

To resolve the above, this PR replaces "@jupyterlab/builder": "^4.3.6 || ^3.6.8", with "@jupyter/builder": "^1.2.2", and also bumps the version of jupyterlab in uv.lock up to 4.6.2.

JavaScript artifacts are also rebuilt following the change.

Testing strategy

• Check out this PR
• Create a new venv
• Run:

uv sync --extra dev_build
cd js
npm ci && npm run build

Make sure the extension builds without error.

Then, verify that the built extension works in Jupyter:

• Run uv pip install -e .
• Run jupyter notebook
• In the Jupyter web interface, create a new notebook and paste the following code:

## FIRST CELL: TESTING FIG.SHOW()
import plotly
import plotly.graph_objects as go

fig = go.Figure(data=go.Scatter(x=[1, 2, 3, 4], y=[1, 3, 2, 4]))
fig.show()  # Figure should render in notebook

## SECOND CELL: TESTING FIGUREWIDGET
import plotly
import plotly.graph_objects as go

print(plotly.__version__)  # Make sure version is correct
fig = go.Figure(data=go.Scatter(x=[1, 2, 3, 4], y=[1, 3, 2, 4]))
figure_widget = go.FigureWidget(fig)
figure_widget  # Figure should render in notebook

Make sure both figures render in the notebook.

Guidelines

• I have reviewed the pull request guidelines and the Code of Conduct and confirm that this PR follows them.
• I have added an entry to the changelog if needed (not required for documentation PRs).