Bump core-js from 2.6.10 to 3.4.0 in /vuejs

Bumps [core-js](https://github.com/zloirock/core-js) from 2.6.10 to 3.4.0.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/compare/v2.6.10...v3.4.0)

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

vuejs/package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "@fullhuman/postcss-purgecss": "^1.3.0",
     "axios": "^0.19.0",
-    "core-js": "^2.6.5",
+    "core-js": "^3.4.0",
     "postcss-import": "^12.0.1",
     "postcss-nested": "^4.1.2",
     "qs": "^6.9.0",

vuejs/yarn.lock

@@ -2612,6 +2612,11 @@ core-js@^2.4.0, core-js@^2.5.0, core-js@^2.6.5:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.10.tgz#8a5b8391f8cc7013da703411ce5b585706300d7f"
   integrity sha512-I39t74+4t+zau64EN1fE5v2W31Adtc/REhzWN+gWRRXg6WH5qAsZm62DHpQ1+Yhe4047T55jvzz7MUqF/dBBlA==
 
+core-js@^3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.4.0.tgz#29ea478601789c72f2978e9bb98f43546f89d3aa"
+  integrity sha512-lQxb4HScV71YugF/X28LtePZj9AB7WqOpcB+YztYxusvhrgZiQXPmCYfPC5LHsw/+ScEtDbXU3xbqH3CjBRmYA==
+
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"