Sonarr has an advanced setting in "Settings > Indexers > [Your indexer] > Fail Downloads" which you should add "Executables" to. Then these kinds of downloads get automatically marked as failed/blacklisted and a new search and new download is attempted without you needing to manually intervene. You may also have to tweak some conflicting settings on qbit.

Alternatively, if there's a way to have qbit itself mark the download as "Failed" when it detects and refuses to download an executable, that would work too. I don't use qbit personally so I don't know if that's a thing it can be configured to do.