ci: revert unnecessary version bump (#2415)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Chores**
- Downgraded version numbers for the Node.js, Python, and Rust packages.
No other user-facing changes were made.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

nodejs/package.json

@@ -11,7 +11,7 @@
     "ann"
   ],
   "private": false,
-  "version": "0.20.0-beta.0",
+  "version": "0.19.2-beta.0",
   "main": "dist/index.js",
   "exports": {
     ".": "./dist/index.js",