PR: Fix return type of _1_2_3 in models.rgb.cylindrical.HCL_to_RGB

[jorenham]

Summary

In numpy/numpy#30246 mypy_primer reported a new error related to numpy.select, which turned out to be a true positive, so I figured I might as well fix it.

Preflight

Code Style and Quality

• Unit tests have been implemented and passed.
• Pyright static checking has been run and passed.
• Pre-commit hooks have been run and passed.
• New transformations have been added to the Automatic Colour Conversion Graph.
• New transformations have been exported to the relevant namespaces, e.g. colour, colour.models.

Documentation

• New features are documented along with examples if relevant.
• The documentation is Sphinx and numpydoc compliant.

[KelSolaar]

Thanks a lot @jorenham!