test images: Trigger the windows-servercore-cache image job

[claudiubelu]

What type of PR is this?

/sig testing
/kind cleanup
/priority important-soon

What this PR does / why we need it:

The postsubmit job for this image was only added recently [1]. We need to commit a change to trigger the job.

[1] kubernetes/test-infra#23350

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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

[k8s-ci-robot]

@claudiubelu: This issue is currently awaiting triage.

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[claudiubelu]

/assign @mkumatag

[mkumatag]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: claudiubelu, mkumatag

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