build(deps): bump @vuepress/plugin-back-to-top from 1.0.2 to 1.0.3

Bumps [@vuepress/plugin-back-to-top](https://github.com/vuejs/vuepress/tree/HEAD/packages/@vuepress/plugin-back-to-top) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/vuejs/vuepress/releases)
- [Changelog](https://github.com/vuejs/vuepress/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vuepress/commits/v1.0.3/packages/@vuepress/plugin-back-to-top)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

site/package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "@vuepress/plugin-back-to-top": "^1.0.2",
+    "@vuepress/plugin-back-to-top": "^1.0.3",
     "@vuepress/plugin-google-analytics": "^1.0.2",
     "@vuepress/plugin-pwa": "^1.0.3",
     "@vuepress/theme-default": "kidonng/vuepress-theme-default",

yarn.lock

@@ -986,10 +986,10 @@
   dependencies:
     lodash.throttle "^4.1.1"
 
-"@vuepress/plugin-back-to-top@^1.0.2":
-  version "1.0.2"
-  resolved "https://registry.npm.taobao.org/@vuepress/plugin-back-to-top/download/@vuepress/plugin-back-to-top-1.0.2.tgz#54b8cd65101b2b660a728d4c7d1203f2aa7a028f"
-  integrity sha1-VLjNZRAbK2YKco1MfRID8qp6Ao8=
+"@vuepress/plugin-back-to-top@^1.0.3":
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/@vuepress/plugin-back-to-top/-/plugin-back-to-top-1.0.3.tgz#f10eb97a85781b044803ae96aceb5006cc6075b0"
+  integrity sha512-GTJKGnxep+2pMi22Uj4dm7kqxbifkRyGU7SrzWa7I26UpbuQ6M87EN6uCoH7CNTapv0O+kwrht7wci4BuPo5wg==
   dependencies:
     lodash.debounce "^4.0.8"