Update Workhorse to v8.45.0

What does this MR do?

Update Workhorse to v8.45.0

CHANGELOG

## v8.45.0

### Added
- Reject upload when filesize exceeds MaximumSize returned by authorize endpoint
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/554

### Other
- Eliminate unnecessary code in GoCloud test stubs
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/590
- Drop tests that check for log messages
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/591

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