Describe the bug

1. My artifact is named as Symbols.Mixed 64-bit.7z
2. GitHub renames or wants to rename it to Symbols.Mixed.64-bit.7z (space replaced with a dot)
3. There is already an artifact named Symbols.Mixed.64-bit.7z.
4. Upload fails with:

HTTP 422: Validation Failed (https://uploads.github.com/repos/<organization>/<repo>/releases/<id>/assets?label=&name=Symbols.Mixed+64-bit.7z)
ReleaseAsset.name already exists

Steps to reproduce the behavior

1. Try to upload an artifact via gh release upload --clobber latest-nightly "Symbols.Mixed 64-bit.7z"

Expected vs actual behavior

--clobber works for artifacts with spaces in names