[release-1.27] Update kubectl verion to v1.27.16

Manual cherrypick required.

#22 failed to apply on top of branch "release-1.27":
```
Applying: Update Dockerfile
Applying: update kubectl verion to v1.27.16
Using index info to reconstruct a base tree...
M Dockerfile
Falling back to patching base and 3-way merge...
Auto-merging Dockerfile
CONFLICT (content): Merge conflict in Dockerfile
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0002 update kubectl verion to v1.27.16
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

```

Open Dockerfile on the release-1.27 branch and inspect the failed patch from #22, using the conflict output to identify the version line that needs reconciliation. Resolve the Dockerfile conflict so kubectl is v1.27.16, then verify the resulting file and image build.

Written by the indexing model from the issue text.