Update compatibility to jupyterlab>=4.1, and update dependencies accordingly, the keyboard shortcuts are not compatible starting from version 4.1.0.

Checklist

• ran doit lint locally

References

Related to #63

Code changes

• switch to 'no windowing' mode, and update some CSS rules on notebook node.
  When the notebook changes to full windowed mode (the default since lab 4.1) some CSS rules are applied to the viewport node, and are not properly removed when switching back to 'no windowing' mode. These rules should be fixed upstream in Jupyterlab, but are also fixed here for backward compatibility.
  • The rule applied on .jp-WindowedPanel-inner has been fixed in lab 2.2 with Fix width and margins of the notebook footer. jupyterlab/jupyterlab#16383
  • Another rule applied to .jp-WindowedPanel-viewport should be fixed with Restore viewport min-height when not windowing jupyterlab/jupyterlab#16979 (comment)
• update the background rule with the new .jp-ThemedContainer
• fix the keyboard shortcut

User-facing changes

None

Backwards-incompatible changes

None