chore: Address github.com/pkg/sftp Denial of Service (DoS)

[davidesalerno]

Motivation

This change will fix the CVE reported by https://app.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPKGSFTP-569475

Modifications

Only go.mod and go.sum will be changed using a github.com/pkg/sftp module version without the security issue.

Result

Avoid issues like Denial of Service (DoS) caused by the old version of the github.com/pkg/sftp module

[oss-prow-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: davidesalerno
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[oss-prow-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: davidesalerno
Once this PR has been reviewed and has the lgtm label, please assign njhill for approval by writing /assign @njhill in a comment. For more information see:The Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[davidesalerno]

@ckadner @Jooho Could you help me reviewing this change?

[davidesalerno]

Closing PR since it's a duplicate of #480