Update entrypoint to Vega-Lite 5 so Altair v5 chart renders

[indigoviolet]

I recently had to update altair to master to address an unrelated issue, and found that altair_viewer's registration no longer worked. Might need to update the entrypoints to something like

https://github.com/vega/ipyvega/blob/e7fb07ce599f78117b94bcaeddd8dc56e5554a38/pyproject.toml#L40

[indigoviolet]

workaround is something like alt.renderers.register('altair_viewer', altair_viewer._viewer.ChartViewer().render)

[joelostblom]

Yes, there will need to be a new release of altair_viewer that matches the version of vega-lite used in the new version of altair before it works out of the box again

[mattijn]

@indigoviolet I have one question. You mention you found a workaround. Can you provide a small complete code snippet how you apply this? I'm wondering how that could work.

[joelostblom]

I think we can close this as #54 was merged. There will be one more update when VL 5.7 is out and after that a new release of altair_viewer will be out.

[mattijn]

I think this can't be closed. It still requires a new entry point for Altair vl 5, around here:

https://github.com/altair-viz/altair_viewer/blob/master/setup.py#L74

[mattijn]

done per #55

[franzhaas]

This now affects the released version of altair 5.0.1 as well as 5.0.0.