chore: update dependencies for @sap/approuter, @cap-js/postgres, and @sap/cds-dk

- Bump @sap/approuter from ^21 to ^21.5.0
- Update @cap-js/postgres from ^2 to ^2.3.0
- Update @sap/cds-dk from ^9 to ^9.9.1

Author: mofterdinger

app/package-lock.json

@@ -1,7 +1,7 @@
 {
 	"name": "approuter",
 	"dependencies": {
-		"@sap/approuter": "^21"
+		"@sap/approuter": "^21.5.0"
 	},
 	"scripts": {
 		"start": "node node_modules/@sap/approuter/approuter.js"