Bump the all-npm-dependencies group across 3 directories with 3 updates

Bumps the all-npm-dependencies group with 2 updates in the / directory: [@sap/cds-dk](https://cap.cloud.sap/) and [@sap/cds](https://cap.cloud.sap/).
Bumps the all-npm-dependencies group with 1 update in the /app directory: @sap/approuter.
Bumps the all-npm-dependencies group with 1 update in the /mtx/sidecar directory: [@sap/cds](https://cap.cloud.sap/).


Updates `@sap/cds-dk` from 8.9.3 to 8.9.4

Updates `@sap/cds` from 8.9.3 to 8.9.4

Updates `@sap/approuter` from 20.3.1 to 20.4.0

Updates `@sap/cds` from 8.9.3 to 8.9.4

---
updated-dependencies:
- dependency-name: "@sap/cds-dk"
  dependency-version: 8.9.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: all-npm-dependencies
- dependency-name: "@sap/cds"
  dependency-version: 8.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-npm-dependencies
- dependency-name: "@sap/approuter"
  dependency-version: 20.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-npm-dependencies
- dependency-name: "@sap/cds"
  dependency-version: 8.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-npm-dependencies
...

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

Author: dependabot[bot]