Bump core-js from 3.30.2 to 3.31.0

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.30.2 to 3.31.0.
- [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/commits/v3.31.0/packages/core-js)

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

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

package.json

@@ -16,7 +16,7 @@
     "braces": "^3.0.2",
     "browser-sync": "^2.29.3",
     "child_process": "^1.0.2",
-    "core-js": "^3.30.2",
+    "core-js": "^3.31.0",
     "del": "^6.1.1",
     "fancy-log": "^2.0.0",
     "fstream": "^1.0.12",