Bump core-js from 3.22.7 to 3.22.8 in /frontend/src/main/webapp (#219)

Bumps [core-js](https://github.com/zloirock/core-js) from 3.22.7 to 3.22.8.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v3.22.7...v3.22.8)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/src/main/webapp/package.json

@@ -43,7 +43,7 @@
     "bootstrap": "4.6.0",
     "chart.js": "2.9.4",
     "classlist.js": "1.1.20150312",
-    "core-js": "3.22.7",
+    "core-js": "3.22.8",
     "flag-icon-css": "4.1.7",
     "follow-redirects": "1.15.0",
     "font-awesome": "4.7.0",