Log Message:
py-ipywidgets: updated to 7.6.3

7.6
---

To see the full list of pull requests and issues, see the [7.6.0 \ 
milestone](https://github.com/jupyter-widgets/ipywidgets/milestone/31?closed=1) \ 
on GitHub.

The main change in this release is that installing `ipywidgets` 7.6.0 will now \ 
automatically enable ipywidgets support in JupyterLab 3.0—a user has no extra \ 
JupyterLab installation step and no rebuild of JupyterLab, nor do they need \ 
Node.js installed. Simply install the python ipywidgets package with pip (`pip \ 
install ipywidgets==7.6.0`) or conda/mamba (`conda install -c conda-forge \ 
ipywidgets=7.6.0`) and ipywidgets will automatically work in classic Jupyter \ 
Notebook and in JupyterLab 3.0.

This is accomplished with the new python package `jupyterlab_widgets` version \ 
1.0, on which `ipywidgets` 7.6.0 now depends (similar to how `ipywidgets` \ 
already depends on the `widgetsnbextension` package to configure ipywidgets for \ 
the classic Jupyter Notebook). The `jupyterlab_widgets` Python package is a \ 
JupyterLab 3.0 prebuilt extension, meaning that it can be installed into \ 
JupyterLab 3.0 without rebuilding JupyterLab and without needing Node.js \ 
installed.

Updates for Widget Maintainers

Custom widget maintainers will need to make two changes to update for JupyterLab 3:

1. Update the `@jupyter-widgets/base` dependency version to include `^4` to work \ 
in JupyterLab 3.0. For example, if you had a dependency on \ 
`@jupyter-widgets/base` version `^2 || ^3`, update to `^2 || ^3 || ^4` for your \ 
widget to work in classic Jupyter Notebook, JupyterLab 1, JupyterLab 2, and \ 
JupyterLab 3.
2. In the `package.json`, add the following `sharedPackages` configuration \ 
inside the `jupyterlab` key. See the [JupyterLab extension \ 
documentation](https://jupyterlab.readthedocs.io/en/stable/extension/extension_dev.html#requiring-a-service) \ 
for more information.

   ```json
     "jupyterlab": {
       "sharedPackages": {
         "@jupyter-widgets/base": {
           "bundled": false,
           "singleton": true
         }
       }
     }
   ```

Separate from these two steps to update for JupyterLab 3, we also recommend that \ 
you make your widget's JupyterLab extension a prebuilt extension for JupyterLab \ 
3.0. Users will be able to install your JupyterLab 3.0 prebuilt extension \ 
without rebuilding JupyterLab or needing Node.js. See the [JupyterLab 3 \ 
extension developer \ 
documentation](https://jupyterlab.readthedocs.io/en/stable/extension/extension_dev.html) \ 
or the new [widget extension \ 
cookiecutter](https://github.com/jupyter-widgets/widget-ts-cookiecutter/tree/jlab3) \ 
for more details.