when running `go mod why -m github.com/kopia/kopia` in velero-plugins prior to this change you will see following
```
❯ go mod why -m github.com/kopia/kopia
github.com/konveyor/openshift-velero-plugin/velero-plugins
github.com/vmware-tanzu/velero/pkg/plugin/framework
github.com/vmware-tanzu/velero/pkg/util/logging
github.com/kopia/kopia/repo/logging
```
after
```
❯ go mod why -m github.com/kopia/kopia
(main module does not need module github.com/kopia/kopia)
```
Signed-off-by: Tiger Kaovilai <tkaovila@redhat.com>
