change ValueError to RuntimeWarning when n_dim < n_informative

[sampan501]

Closes #278

Changes proposed in this pull request:

• Sets n_informative to n_dim when n_dim < n_informative
• Raises a RuntimeWarning

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[sampan501]

I think errors are related to some issue with spin and not this PR

[PSSF23]

Agreed that the errors are not related to the changes.

[PSSF23]

Apparently the python version of CircleCI was wrong. I don't know how the tests pass in the past.

[PSSF23]

The issue with build doc was confirmed to be associated with the latest sklearn==1.5.0, so we should have fixed it by modifying the import path.

[PSSF23]

3.11 seems too new.

[sampan501]

3.11 seems too new.

I only did it since I thought it might be able to fix doc build issues, but it did not

[PSSF23]

@sampan501 doc problem solved. I'll open another one to work on tutorials so this one can be closed.