The action should fail with an error if the files: settings are not valid

[rpdelaney]

Example: https://github.com/rpdelaney/downforeveryone/actions/runs/6149726050/job/16686210047

🤔 dist/downforeveryone*.whl,dist/downforeveryone*.tar.gz not include valid file.

Instead of simply failing, this workflow run instead published a release with all the files in the repo: https://github.com/rpdelaney/downforeveryone/releases/tag/v1.0.5

This is a significant issue because it hides the fact that the action is not doing what the user expected and ends with success. The warnings are buried in the folds so I did not discover the problem until the release archive was already out there and downloaded.