fix workspaces util script

Author: hsubox76

scripts/release/utils/workspace.ts

@@ -27,8 +27,8 @@ const writeFile = promisify(_writeFile);
 
 const {
   workspaces: rawWorkspaces
-}: { workspaces: string[] } = require(`${root}/package.json`);
-const workspaces = rawWorkspaces.map(workspace => `${root}/${workspace}`);
+}: { workspaces: { packages: string[] } } = require(`${root}/package.json`);
+const workspaces = rawWorkspaces.packages.map(workspace => `${root}/${workspace}`);
 
 export function mapWorkspaceToPackages(
   workspaces: string[]