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

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.60%. Comparing base (82b5e1e) to head (12c7562).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #197   +/-   ##
=======================================
  Coverage   58.60%   58.60%           
=======================================
  Files           5        5           
  Lines         244      244           
=======================================
  Hits          143      143           
  Misses         87       87           
  Partials       14       14           

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