chore(deps): Bump core-js in /build/frontend-legacy

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.48.0 to 3.49.0.
- [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/v3.49.0/packages/core-js)

---
updated-dependencies:
- dependency-name: core-js
  dependency-version: 3.49.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -60,7 +60,7 @@
     "cancelable-promise": "^4.3.1",
     "clipboard": "^2.0.11",
     "color": "^5.0.3",
-    "core-js": "^3.48.0",
+    "core-js": "^3.49.0",
     "crypto-browserify": "^3.12.1",
     "davclient.js": "nextcloud-deps/davclient.js#59d7777d7fe290c5f1fd74a58e7eb529b63e153d",
     "debounce": "^3.0.0",