Bump rollup from 2.40.0 to 2.68.0 in /Gatekeeper.Client

Bumps [rollup](https://github.com/rollup/rollup) from 2.40.0 to 2.68.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.40.0...v2.68.0)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gatekeeper.Client/package-lock.json

@@ -11,7 +11,7 @@
     "dart-sass": "^1.25.0",
     "gulp": "^4.0.2",
     "gulp-sass": "^4.1.0",
-    "rollup": "^2.40.0",
+    "rollup": "^2.68.0",
     "rollup-plugin-terser": "^7.0.2",
     "stylelint": "^13.11.0",
     "stylelint-config-standard": "^20.0.0"