fix: Merge all wheel artifacts into dist for publish discovery.

[sharkinsspatial]

The Pypi publish workflow step was failing with

FileNotFoundError: [Errno 2] No such file or directory: '/github/workspace/dist'
Warning:  It looks like there are no Python distribution packages to publish in the directory 'dist/'. Please verify that they are in place should you face this problem.
ERROR    InvalidDistribution: Cannot find file (or expand pattern): 'dist/*

This consolidates all the wheels into the /dist directory so they can be discovered by the publish workflow.