Updating ose-agent-installer-orchestrator images to be consistent wit…

…h ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/da6a5af1fa96762cc8410f09fc28c0457280f59a/images/ose-agent-installer-orchestrator.yml

.ci-operator.yaml

@@ -1,4 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-8-release-golang-1.20-openshift-4.14
+  tag: rhel-8-release-golang-1.20-openshift-4.15

Dockerfile.assisted-installer.ocp

@@ -1,4 +1,4 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.14 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.15 AS builder
 
 WORKDIR /go/src/github.com/openshift/assisted-installer
 ENV GOFLAGS="-mod=vendor"
@@ -7,7 +7,7 @@ COPY . .
 
 RUN make installer
 
-FROM registry.ci.openshift.org/ocp/4.14:base
+FROM registry.ci.openshift.org/ocp/4.15:base
 
 LABEL io.openshift.release.operator=true