Bump core-js from 3.20.1 to 3.20.3 in /samples/lib/spa-angular-client

Bumps [core-js](https://github.com/zloirock/core-js) from 3.20.1 to 3.20.3.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v3.20.1...v3.20.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

samples/lib/spa-angular-client/package-lock.json

@@ -31,7 +31,7 @@
     "@ng-bootstrap/ng-bootstrap": "^11.0.0",
     "bootstrap": "^4.6.0",
     "bowser": "^2.11.0",
-    "core-js": "^3.20.1",
+    "core-js": "^3.20.3",
     "rxjs": "~7.5.2",
     "tslib": "^2.3.1",
     "zone.js": "~0.11.4"