Update service-royalroad-chapters image to version 6

Linked build commit: 255dd4cc59

service-seadex/deployment.yaml

@@ -50,7 +50,7 @@ spec:
               mountPath: /etc/secrets
       containers:
         - name: service-seadex
-          image: ghcr.io/gansejunge/app-notifications-service-seadex:5
+          image: ghcr.io/gansejunge/app-notifications-service-seadex:6
           ports:
             - containerPort: 5000
               name: fastapi