Bump @sap/cds from 6.1.3 to 8.9.1 in /samples/cds-sample-application

Bumps [@sap/cds](https://cap.cloud.sap/) from 6.1.3 to 8.9.1.

---
updated-dependencies:
- dependency-name: "@sap/cds"
  dependency-version: 8.9.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]