📌 Pin scikit-build-core

[denialhaag]

Description

This PR pins scikit-build-core to ~=0.12 to prevent it from upgrading to version 1.0. The new version is incompatible with nanobind.stubgen. Once this issue is resolved, we can upgrade to 1.0 and benefit from the improved system for dynamic metadata. In particular, we should finally be able to drop our dependency on setuptools-scm.

Checklist

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• I have added entries to the changelog for any noteworthy additions, changes, fixes, or removals.
• I have added migration instructions to the upgrade guide (if needed).
• The changes follow the project's style guidelines and introduce no new warnings.
• The changes are fully tested and pass the CI checks.
• I have reviewed my own code changes.

[denialhaag]

@burgholzer, do we also want to merge this here for now? As we don't have the problem with editable installs here, nanobind.stubgen is the only issue. We could also go with 67d21dd instead, at the cost of having diverging configurations across our repositories. 🤔

[burgholzer]

@burgholzer, do we also want to merge this here for now? As we don't have the problem with editable installs here, nanobind.stubgen is the only issue. We could also go with 67d21dd instead, at the cost of having diverging configurations across our repositories. 🤔

Let's get this in here as well and fix everything consistently later