code: public void deleteDeployKey(Integer targetProjectId, Integer targetKeyId) throws IOException {
          String tailUrl = GitlabProject.URL + "/" + targetProjectId + GitlabSSHKey.DEPLOY_KEYS_URL + "/" + targetKeyId;
          retrieve().method(DELETE).to(tailUrl, Void.class);
      }
docs: Delete a deploy key for a project
  
  @param targetProjectId The id of the Gitlab project
  @param targetKeyId     The id of the Gitlab ssh key
  @throws IOException on gitlab api call error