fix chart versioning issue

Signed-off-by: Jordan Dubrick <jdubrick@redhat.com>

Author: Jdubrick

charts/backstage/README.md

@@ -29,7 +29,7 @@ For the **Generally Available** version of this chart, see:
 helm repo add bitnami https://charts.bitnami.com/bitnami
 helm repo add redhat-developer https://redhat-developer.github.io/rhdh-chart
 
-helm install my-backstage redhat-developer/backstage --version 5.8.1
+helm install my-backstage redhat-developer/backstage --version 5.9.0
 ```
 
 ## Introduction