Update to ubi9 builder and base images (#308)

Signed-off-by: Scott Seago <sseago@redhat.com>

Dockerfile.ubi

@@ -1,20 +1,19 @@
-# TODO! Find a real ubi8 image for golang 1.16
-FROM quay.io/konveyor/builder:latest AS builder
+FROM quay.io/konveyor/builder:ubi9-v1.20 AS builder
 ENV GOPATH=$APP_ROOT
 COPY . /go/src/github.com/vmware-tanzu/velero
 WORKDIR /go/src/github.com/vmware-tanzu/velero
 RUN CGO_ENABLED=0 GOOS=linux go build -a -mod=mod -ldflags '-extldflags "-static" -X github.com/vmware-tanzu/velero/pkg/buildinfo.Version=1.12.3' -o /go/src/velero github.com/vmware-tanzu/velero/cmd/velero
 RUN CGO_ENABLED=0 GOOS=linux go build -a -mod=mod -ldflags '-extldflags "-static"' -o /go/src/velero-helper github.com/vmware-tanzu/velero/cmd/velero-helper
 
-FROM quay.io/konveyor/builder:latest AS restic-builder
+FROM quay.io/konveyor/builder:ubi9-v1.20 AS restic-builder
 ENV GOPATH=$APP_ROOT
 RUN mkdir -p $APP_ROOT/src/github.com/restic \
 && cd $APP_ROOT/src/github.com/restic \
 && git clone https://github.com/konveyor/restic -b oadp-1.3
 WORKDIR $APP_ROOT/src/github.com/restic/restic
 RUN CGO_ENABLED=0 GOOS=linux go build -a -mod=mod -ldflags '-extldflags "-static"' -o $APP_ROOT/src/restic github.com/restic/restic/cmd/restic
 
-FROM registry.access.redhat.com/ubi8-minimal
+FROM registry.access.redhat.com/ubi9-minimal
 RUN microdnf -y update && microdnf -y install nmap-ncat && microdnf clean all
 COPY --from=builder /go/src/velero velero
 COPY --from=builder /go/src/velero-helper velero-helper