Update TLS certificate generation container image

Author: astefanutti

config/e2e/config.yaml

@@ -7,6 +7,6 @@ data:
     kuberay:
       rayDashboardOAuthEnabled: false
       ingressDomain: "kind"
-      certGeneratorImage: quay.io/project-codeflare/ray:2.20.0-py39-cu118
+      certGeneratorImage: registry.access.redhat.com/ubi9@sha256:770cf07083e1c85ae69c25181a205b7cdef63c11b794c89b3b487d4670b4c328
     appwrapper:
       enabled: true