Agnhost version sync

[BenTheElder]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

I also:

• made the cobra.Command in agnhost.go multiline for easier matching on the right field
• updated the out of sync agnhost source image versions

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[BenTheElder]

these have de-synced multiple times. most recently caught in #94135 (comment)

[BenTheElder]

I suspect there are more, but I didn't turn up any that are obviously intended to be in sync here yet.
If nothing else though, this entry should prevent an incorrect addition of this file to the entry above.

There is also the rarely updated private image from this that we literally only use to test pulling a private image (w/ auth).

[justaugustus]

/lgtm
/approve
/milestone v1.19

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, justaugustus

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Needs approval from an approver in each of these files:

• build/OWNERS [BenTheElder,justaugustus]
• test/images/agnhost/OWNERS [BenTheElder]

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[spiffxp]

This missed updating test/utils/image/manifest.go, suggested update in https://github.com/kubernetes/kubernetes/pull/89582/files#r480392573