chore: expand default cluster to ease install

Signed-off-by: Chris Butler <chris.butler@redhat.com>

Author: butler54

rhdp/install-config.yaml.j2

@@ -8,7 +8,7 @@ compute:
   platform:
     azure:
       type: Standard_D8s_v5
-  replicas: 3
+  replicas: 5
 controlPlane:
   architecture: amd64
   hyperthreading: Enabled