Update workflow improvements

[jtpio]

Tracking improvements for the workflow to update to newer JupyterLab versions: https://github.com/jupyter/notebook/actions/workflows/upgrade-juypterlab-dependencies.yml

The workflow was originally added in #7281.

• open the PR automatically
• use the github-actions user to open the PR

• some logic to bump the dependency on the jupyterlab Python package. At least when we update to a new minor version. Or make that configurable in the workflow.

notebook/pyproject.toml

Line 2 in c0ddf01

requires = ["hatchling>=1.11", "jupyterlab>=4.3.2,<4.4"]

notebook/pyproject.toml

Line 35 in c0ddf01

"jupyterlab>=4.3.2,<4.4",

Example PR which updated to a patch release: https://github.com/jupyter/notebook/pull/7527/files

[jtpio]

Re-opening to track more improvements:

• Update to JupyterLab v4.3.4 #7551 did not update @jupyterlab/galata:

notebook/ui-tests/package.json

Line 18 in 0d49b45

"@jupyterlab/galata": "~5.3.2",

[jtpio]

More cases to consider:

• handle pre-release cycles. Currently main is on JupyterLab 4.4.0a1, but the latest version as retrieved by the script will be 4.3.4. So it should first check if the target branch is using a pre-release, and make sure updates are for newer versions
• we should ideally be able to run the workflow for other backport branches to, for example to update 7.3.x while main is still targeting 7.4.0