Fix bumping the Homebrew formula

The gh formula in homebrew-core went back and forth between git-style
and tarball-style. Now that it's back to tarball, update the action to
reflect that.

.github/workflows/releases.yml

@@ -157,7 +157,6 @@ jobs:
         if: "!contains(github.ref, '-')" # skip prereleases
         with:
           formula-name: gh
-          download-url: https://github.com/cli/cli.git
         env:
           COMMITTER_TOKEN: ${{ secrets.UPLOAD_GITHUB_TOKEN }}
       - name: Checkout scoop bucket