chore: cleaning up final references to slim from skaffold

[Darien-Lin]

Description
Removing final references to slim in /hack

[code-review-assist]

Hi team,

I'm currently reviewing this pull request and will have a full review up in a few minutes. In the meantime, here's a quick summary to help you and other reviewers get up to speed:

This PR, by Darien-Lin, aims to clean up remaining references to 'slim' within the Skaffold hack directory. Specifically, the change modifies the update-lts-dependencies.sh script. The script iterates through Dockerfiles, updating environment variables. This PR removes the Dockerfile.deps.slim entry from the loop, effectively removing the processing of this specific Dockerfile.

The intent is likely to simplify the build process and remove any unnecessary dependencies related to the 'slim' variant, perhaps due to its deprecation or removal. The change is localized to a single script and appears straightforward.

---

And now, a little haiku to lighten the mood:

Slim's shadow departs,
Clean code shines, a brighter day,
Skaffold builds anew.

Thanks,
[Your Name]

[code-review-assist]

This pull request removes the final references to slim in the hack/update-lts-dependencies.sh script. This change seems aligned with the intent described in the pull request title and description. Overall, the change is small and straightforward. However, I have a few suggestions for improvement.

[code-review-assist]

Since Dockerfile.deps.slim is being removed, could you please add a comment explaining why this file is no longer needed? This will help future maintainers understand the reasoning behind this removal and prevent potential confusion or accidental reintroduction. For example, you could mention if the slim variant is deprecated or if it's being replaced by another approach.

Suggested change

	for dockerfile in "Dockerfile.deps" "Dockerfile.deps.lts"; do
	for dockerfile in "Dockerfile.deps" "Dockerfile.deps.lts"; do # Removed Dockerfile.deps.slim as it's no longer needed (reason)

[code-review-assist]

Now that Dockerfile.deps.slim is removed, it's a good opportunity to review if these sed commands are still optimal. Since the loop now only iterates over two files instead of three, it might be simpler and more readable to replace the loop with two separate sed commands, one for each Dockerfile. This avoids the loop overhead and makes the script slightly easier to understand at a glance.

Suggested change

	sed -i "s/ENV KUBECTL_VERSION .*/ENV KUBECTL_VERSION ${KUBECTL_VERSION}/" ${DOCKERFILE_DIR}/${dockerfile}
	sed -i "s/ENV HELM_VERSION .*/ENV HELM_VERSION ${HELM_VERSION}/" ${DOCKERFILE_DIR}/${dockerfile}
	sed -i "s/ENV KUSTOMIZE_VERSION .*/ENV KUSTOMIZE_VERSION ${KUSTOMIZE_VERSION}/" ${DOCKERFILE_DIR}/${dockerfile}
	sed -i "s/ENV KUBECTL_VERSION .*/ENV KUBECTL_VERSION ${KUBECTL_VERSION}/" ${DOCKERFILE_DIR}/Dockerfile.deps
	sed -i "s/ENV HELM_VERSION .*/ENV HELM_VERSION ${HELM_VERSION}/" ${DOCKERFILE_DIR}/Dockerfile.deps
	sed -i "s/ENV KUSTOMIZE_VERSION .*/ENV KUSTOMIZE_VERSION ${KUSTOMIZE_VERSION}/" ${DOCKERFILE_DIR}/Dockerfile.deps
	sed -i "s/ENV KUBECTL_VERSION .*/ENV KUBECTL_VERSION ${KUBECTL_VERSION}/" ${DOCKERFILE_DIR}/Dockerfile.deps.lts
	sed -i "s/ENV HELM_VERSION .*/ENV HELM_VERSION ${HELM_VERSION}/" ${DOCKERFILE_DIR}/Dockerfile.deps.lts
	sed -i "s/ENV KUSTOMIZE_VERSION .*/ENV KUSTOMIZE_VERSION ${KUSTOMIZE_VERSION}/" ${DOCKERFILE_DIR}/Dockerfile.deps.lts