chore: prep cds^9 (#28)

Author: sjvans

package.json

@@ -18,7 +18,7 @@
     "test": "npx jest --silent"
   },
   "peerDependencies": {
-    "@sap/cds": ">=7"
+    "@sap/cds": ">=8"
   },
   "devDependencies": {
     "@cap-js/event-broker": "file:.",