Revert "chore: update version"

This reverts commit e24428b.

Author: Semro

packages/syncwatch-extension/manifest.ts

@@ -3,7 +3,7 @@ const manifest = {
   '{{chrome}}.manifest_version': 3,
   name: '__MSG_appName__',
   description: '__MSG_appDesc__',
-  version: '0.520',
+  version: '0.510',
   default_locale: 'en',
   options_ui: {
     page: 'options.html',