Bump vue from 3.4.15 to 3.4.21 (#171)

Author: dependabot[bot]

package.json

@@ -12,7 +12,7 @@
     "devDependencies": {
         "@vuepress/bundler-vite": "2.0.0-rc.7",
         "@vuepress/theme-default": "2.0.0-rc.12",
-        "vue": "^3.4.15",
+        "vue": "^3.4.21",
         "vuepress": "2.0.0-rc.7",
         "vuepress-plugin-md-enhance": "2.0.0-rc.23",
         "vuepress-plugin-search-pro": "2.0.0-rc.23"