Use Terraform 1.8-rc1 for bundling schemas (hashicorp#1669)

Author: dbanck

internal/schemas/gen/gen.go

@@ -114,9 +114,11 @@ func gen() error {
 	i := hcinstall.NewInstaller()
 	execPath, err := i.Ensure(ctx, []src.Source{
 		&releases.LatestVersion{
-			Product:     product.Terraform,
-			InstallDir:  installDir,
-			Constraints: terraformVersion,
+			Product:    product.Terraform,
+			InstallDir: installDir,
+			// TODO! Update after 1.8 GA
+			// Constraints: terraformVersion,
+			IncludePrereleases: true,
 		},
 	})
 	if err != nil {