Add version cap to Jupyterlab

[akchinSTC]

Signed-off-by: Alan Chin akchin@us.ibm.com

With the new release of JL 4.0 on the horizon and our pivot to rebase on it in our next release, we should cap our current dependency on it to avoid any potential issues moving forward.

What changes were proposed in this pull request?

How was this pull request tested?

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[ptitzler]

LGTM!

[kevin-bates]

Thanks @akchinSTC.