FTBFS (test failure) with jupyter-client >= 8

[Andreas Hasenack]

________________________ KernelAPITest.test_connections ________________________

self = <notebook.services.kernels.tests.test_kernels_api.KernelAPITest testMethod=test_connections>

    def test_connections(self):
        kid = self.kern_api.start().json()['id']
        model = self.kern_api.get(kid).json()
        self.assertEqual(model['connections'], 0)

> ws = self.kern_api.websocket(kid)
...
> return future_cell[0].result()
E tornado.simple_httpclient.HTTPTimeoutError: Timeout during request

This is failing with jupyter-client 8.6.0-0ubuntu1, which is in noble-proposed, but passes with version 7.4.9-2 from the release pocket.

I found an upstream bug[1], still open, which has a workaround commit[2]: limit jupyter-client to < 8.

Another consumer of jupyter-client investigated a bit further, as they were seeing the same problem, and documented their findings in [3]. That resulted in this commit[4] for that project, but I don't know how to "translate" that to jupyter-notebook.

It might be simpler for noble to just remove jupyter-client 8.6.0-0ubuntu1 from noble-proposed. I don't know why ubuntu went ahead of debian with that upload, there is no closing bug mentioned in d/changelog.

1. https://github.com/jupyter/notebook/issues/6748
2. https://github.com/jupyter/notebook/pull/6749/files
3. https://github.com/jupyter/nbconvert/issues/1964#issuecomment-1495629089
4. https://github.com/jupyter/nbconvert/pull/1972/files

[Andreas Hasenack (ahasenack)]

This was fixed with https://launchpad.net/ubuntu/+source/jupyter-client/7.4.9-2ubuntu1. jupyter-client 8.6.0-0ubuntu1 was removed from noble-proposed by an AA.