chore(deps-dev): bump @sap/cds from 6.8.4 to 8.4.1 (#5163)

Bumps [@sap/cds](https://cap.cloud.sap/) from 6.8.4 to 8.4.1.

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

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Author: dependabot[bot]