mgr/dashboard: bump @swimlane/ngx-datatable

Bumps [@swimlane/ngx-datatable](https://github.com/swimlane/ngx-datatable) from 18.0.0 to 20.1.0.
- [Release notes](https://github.com/swimlane/ngx-datatable/releases)
- [Changelog](https://github.com/swimlane/ngx-datatable/blob/master/docs/CHANGELOG.md)
- [Commits](swimlane/ngx-datatable@18.0.0...20.1.0)

---
updated-dependencies:
- dependency-name: "@swimlane/ngx-datatable"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]