Improve security on goreleaser brew step

[wesleymccollam]

Change Description

Change from Personal Access Token usage to generating token in runner for goreleaser brew repo step

Change Characteristics

• This PR contains beta functionality
• This PR requires introduction of breaking changes

Checklist

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If contributing a partial or incomplete change (expecting the development team to complete the remaining work) please leave the box unchecked

• [ X] Check to confirm: I have performed a review of my PR against the PR checklist and confirm that:
  • Changes have proper unit and acceptance test coverage (including regression tests)
  • Impacted command, parameter and flag descriptions have been reviewed and updated
  • Impacted command examples have been reviewed and updated
  • Impacted documentation files have been reviewed and updated
  • Does not introduce breaking changes to commands, parameters or flags (unless required to do so)
  • I am aware that changes to generated code may not be merged