@lumino/polling doesn't exist in shared scope default

[martinRenou]

@lumino/polling may be missing from the shared scope in the latest version:

Error: Shared module @lumino/polling doesn't exist in shared scope default

[martinRenou]

Actually it is https://github.com/voila-dashboards/voila/blob/main/packages/voila/src/sharedscope.ts#L10

I see this error when testing bloomberg/ipydatagrid#498 with Voila. It seems ipydatagrid has issues when it comes to Lumino shared packages as it needs to specify them as shared: https://github.com/bloomberg/ipydatagrid/blob/main/package.json#L135