mockgen deprecated: use uber-go/mock instead

[sebrandon1]

https://github.com/golang/mock is marked as archived as of June 27, 2023. They recommend using go.uber.org/mock.

This PR attempts to change the dependency to one that is maintained.

Tracking issue: redhat-best-practices-for-k8s/telco-bot#45

[openshift-ci]

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[openshift-ci]

@sebrandon1: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify	84a65e1	link	true	/test verify
ci/prow/unit	84a65e1	link	true	/test unit
ci/prow/coverage	84a65e1	link	true	/test coverage
ci/prow/verify-deps	84a65e1	link	true	/test verify-deps
ci/prow/e2e-azure-manual-oidc	84a65e1	link	true	/test e2e-azure-manual-oidc

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