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

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.49.0 to 3.50.0.
- [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/v3.50.0/packages/core-js)

---
updated-dependencies:
- dependency-name: core-js
  dependency-version: 3.50.0
  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

@@ -59,7 +59,7 @@
     "camelcase": "^9.0.0",
     "cancelable-promise": "^4.3.1",
     "color": "^5.0.3",
-    "core-js": "^3.49.0",
+    "core-js": "^3.50.0",
     "crypto-browserify": "^3.12.1",
     "debounce": "^3.0.0",
     "dompurify": "^3.4.13",