Libertem

The 0.12 release introduces a dedicated Centre-of-Mass analysis UDF with additional features compared to the existing `Context.create_com_analysis()` API. The dedicated UDF allows more straightforward live processing support, and can be subclassed as in the [LiberTEM-iCoM](https://github.com/LiberTEM/LiberTEM-iCoM>) project.

Please see [the full changelog](https://libertem.github.io/LiberTEM/changelog.html#v0-12-0) for details.

This release works around compatibility issues of hdbscan with the latest scikit-learn release 1.3.0. Also includes small fixes to make sure CI runs successfully.

This point release works around [issue 8940 in numba 0.57.0](https://github.com/numba/numba/issues/8940), which can cause crashes under certain circumstances.