CI fails due to jsonschema.RefResolver being deprecated

[andrii-i]

Description

Test jupyterlab_server CI step fails (see all latest runs on main, for example this) because jsonschema.RefResolver is deprecated as of v4.18.0, in favor of the https://github.com/python-jsonschema/referencing library:

DeprecationWarning: jsonschema.RefResolver is deprecated as of v4.18.0, in favor of the https://github.com/python-jsonschema/referencing library, which provides more compliant referencing behavior as well as more flexible APIs for customization. A future release will remove RefResolver. Please file a feature request (on referencing) if you are missing an API for the kind of customization you need.

Affects downstream extensions, for example https://github.com/jupyter-server/jupyter-scheduler/pull/387 (CI run).

Reproduce

See latest jupyterlab_server CI Job runs, for example this

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[blink1073]

Fixed by https://github.com/jupyterlab/jupyterlab_server/releases/tag/v2.24.0

[andrii-i]

Thank you @blink1073

[blink1073]

Hmm, we're still seeing this in recent PRs

[blink1073]

I believe this will be fixed by https://github.com/jupyter/jupyter_events/pull/80 once I cut a release tomorrow.