Bump core-js from 3.18.3 to 3.19.0

Bumps [core-js](https://github.com/zloirock/core-js) from 3.18.3 to 3.19.0.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v3.18.3...v3.19.0)

---
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

@@ -48,7 +48,7 @@
     "bootstrap": "^4.6.0",
     "camelcase": "^6.2.0",
     "clipboard": "^2.0.8",
-    "core-js": "^3.18.3",
+    "core-js": "^3.19.0",
     "css-vars-ponyfill": "^2.4.7",
     "davclient.js": "git+https://github.com/owncloud/davclient.js.git#0.2.1",
     "debounce": "^1.2.1",