See

• https://github.com/ergebnis/composer-normalize/runs/447714280
• https://github.com/ergebnis/composer-normalize/blob/57c77f496d34a873475300e65613f8ed1fa5b624/.github/workflows/continuous-deployment.yml

The workflow should probably be configured to

• create a release when none exists
• update an existing release when it exists

This way it would be possible to re-run the workflow.

Other than that, it needs to be investigated why the upload failed.