[velero] Update kubectl image repository from bitnami to registry.k8s.io#700

SheryarButt wants to merge 2 commits intovmware-tanzu:mainvmware-tanzu/helm-charts:mainfrom

SheryarButt:chore/migrate-from-bitnamiSheryarButt/helm-charts:chore/migrate-from-bitnamiCopy head branch name to clipboard