Bump go.uber.org/mock from 0.4.0 to 0.5.1 in /hack/tools

[Prajyot-Parab]

What this PR does / why we need it:

• Bump go.uber.org/mock from 0.4.0 to 0.5.1 in /hack/tools

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Bump go.uber.org/mock from 0.4.0 to 0.5.1 in /hack/tools

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[Prajyot-Parab]

/cc @Amulyam24

[Amulyam24]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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