chore: update sponsors (#2461) (#2010)

Co-authored-by: vue-bot <bot@vuejs.org>

Author: vuejs-jp-bot

themes/vue/_config.yml

@@ -117,3 +117,6 @@ bronze_sponsors:
   - url: 'https://www.earthlink.ro'
     img: earthlink.png
     name: Earthlink
+  - url: 'https://www.webucator.com'
+    img: webucator.png
+    name: Webucator