docs: public List<SshKey> getSshKeys(Integer userId) throws GitLabApiException {
  
          if (userId == null) {
              throw new RuntimeException("userId cannot be null");
          }
  
          Response response = get(Response.Status.OK, getDefaultPerPageParam(), "users", userId, "keys");
          List<SshKey> keys = response.readEntity(new GenericType<List<SshKey>>() {});
  
          if (keys != null) {
              keys.forEach(key -> key.setUserId(userId));
          }
  
          return (keys);
      }