Use CAP Java 4.0.2, cds-dk ^9 and cds-mtxs ^3 (#498)

This PR updates the Bookshop to new major versions of several CAP
components:
- CAP Java 4.0.2
- @sap/cds-dk ^9
- @sap/cds ^9
- @sap/cds-compiler ^6
- @sap/cds-mtxs ^3

It also adopts new default values ​​for configuration parameters and
removes outdated settings:
- removed from `.cdsrc.json`:
  - `sql.native_hana_associations: false` -> new default in cds ^9
  - `cdsc.newParser: true` -> new default in cdsc ^6
- removed from `mtx/sidecar/package.json`:
  ```
   "[development]": {
      "requires": { "auth": "dummy" }
    }
  ```

---------

Co-authored-by: Marc Becker <[email protected]>

Author: mofterdinger

.cdsrc.json

@@ -9,12 +9,8 @@
         "containment": true
     },
     "cdsc": {
-        "newParser": true,
         "beta": {
             "draftMessages": true
         }
-    },
-    "sql": {
-        "native_hana_associations": false
     }
 }