cabal-head prerelase date and commit are not updated

[ulysses4ever]

Follow-up on #10515

The new release action doesn't update the date on the prerelease itself nor the commit it says was used to create the prerelease. It only updates the binaries and that's it...

(0d80d52 is from October 3rd.)

We probably should explicitly remove the old prerelease before calling the release action (e.g. via https://github.com/marketplace/actions/delete-a-release).