replace the UUID library in the shim repo

The library we use github.com/satori/go.uuid has a CVE open against it and has had for a long time. Maintenance of the code is also questionable.
We should move to github.com/google/uuid v1.2.0.
That would be a simple replacement of uuid.NewV4().String() with uuid.NewString()

This latest version provides a uuid.NewString() method if we stick with an older version it would become uuid.New().String()