Bump ubi8/ubi-minimal from 8.7 to 8.8 in /images/helm-operator

Bumps ubi8/ubi-minimal from 8.7 to 8.8.

---
updated-dependencies:
- dependency-name: ubi8/ubi-minimal
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

images/helm-operator/Dockerfile

@@ -17,7 +17,7 @@ COPY . .
 RUN GOOS=linux GOARCH=$TARGETARCH make build/helm-operator
 
 # Final image.
-FROM registry.access.redhat.com/ubi8/ubi-minimal:8.7
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.8
 
 ENV HOME=/opt/helm \
     USER_NAME=helm \