fix(deps): bump core-js from 3.15.1 to 3.16.4

Bumps [core-js](https://github.com/zloirock/core-js) from 3.15.1 to 3.16.4.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v3.15.1...v3.16.4)

---
updated-dependencies:
- dependency-name: core-js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -13,7 +13,7 @@
     "@nuxtjs/pwa": "^3.3.5",
     "@nuxtjs/sitemap": "^2.4.0",
     "@tailwindcss/typography": "^0.4.1",
-    "core-js": "^3.15.1",
+    "core-js": "^3.16.4",
     "nuxt": "^2.15.6"
   },
   "devDependencies": {