fix: remove broken postbump script from .versionrc.json

The postbump referenced sync-native-versions.js which does not exist
(only .ts exists). The npm version lifecycle in package.json already
handles native version syncing correctly via node-ts.js, making this
entry both redundant and broken.

Closes #823

Author: carlos-alm

.versionrc.json

@@ -14,8 +14,5 @@
     { "type": "release", "hidden": true }
   ],
   "releaseCommitMessageFormat": "release: v{{currentTag}}",
-  "tagPrefix": "v",
-  "scripts": {
-    "postbump": "node scripts/sync-native-versions.js"
-  }
+  "tagPrefix": "v"
 }