code: def update_pull_request_reviewers(self, patch_votes, repository_id, pull_request_id, project=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if repository_id is not None:
              route_values['repositoryId'] = self._serialize.url('repository_id', repository_id, 'str')
          if pull_request_id is not None:
              route_values['pullRequestId'] = self._serialize.url('pull_request_id', pull_request_id, 'int')
          content = self._serialize.body(patch_votes, '[IdentityRefWithVote]')
          self._send(http_method='PATCH',
                     location_id='4b6702c7-aa35-4b89-9c96-b9abf6d3e540',
                     version='5.0',
                     route_values=route_values,
                     content=content)
docs: UpdatePullRequestReviewers.
          Reset the votes of multiple reviewers on a pull request.  NOTE: This endpoint only supports updating votes, but does not support updating required reviewers (use policy) or display names.
          :param [IdentityRefWithVote] patch_votes: IDs of the reviewers whose votes will be reset to zero
          :param str repository_id: The repository ID of the pull request’s target branch.
          :param int pull_request_id: ID of the pull request
          :param str project: Project ID or project name