fix: Merge all artifacts into the dist directory prior to publish.

[sharkinsspatial]

Current pyPI publishing fails 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 should consolidate all wheels in the /dist directory so the publish action can discover them.