Allow overriding install options on upstream about jupyter_releaser

[jtpio]

I did a quick test with the "Generate Changelog" workflow with #251 and after updating refs to point to my fork: main...jtpio:tmp, targeting jupyterlab/jupyterlab.

The logs of the run in https://github.com/jtpio/jupyter_releaser/runs/4963769487 seem to be showing the prep-git step went through:

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[blink1073]

From looking at the discussion, maybe it is enough for now to upgrade setuptools in the venv here.

[bollwyvl]

Mmm, indeed... Maybe wheel as well? Had caused issues in the past. Either way, having some escape hatches from some of these things, either as args or well-known files, might help avoid leaving build dead in the water.

[jtpio]

This could also be useful for packages using something else than test as extras_require.

[fcollonval]

From looking at the discussion, maybe it is enough for now to upgrade setuptools in the venv here.

The error is triggered in prep-git step. It does not seems to be run in a the mentioned venv, is it?