dnfjson: drop repo checksums

The repository checksums in the response from dnf-json aren't used
anywhere.  Since we're making changes to dnf-json and depsolving, now is
a good opportunity to drop them completely.

cmd/osbuild-store-dump/main.go

@@ -27,7 +27,7 @@ func getManifest(bp blueprint.Blueprint, t distro.ImageType, a distro.Arch, d di
 		if err != nil {
 			panic(err)
 		}
-		pkgSpecSets[name] = res.Dependencies
+		pkgSpecSets[name] = res
 	}
 	manifest, err := t.Manifest(bp.Customizations, distro.ImageOptions{}, repos, pkgSpecSets, 0)
 	if err != nil {