revert: restore @contentstack/cli version to 2.0.0-beta.30

Rolls back the premature 2.0.0 bump. Final version bump will be
done as the last step before merging development into main.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: cs-raj

packages/contentstack/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@contentstack/cli",
   "description": "Command-line tool (CLI) to interact with Contentstack",
-  "version": "1.67.0",
+  "version": "2.0.0-beta.30",
   "author": "Contentstack",
   "bin": {
     "csdx": "./bin/run.js"