docs: def update_repodata(self, channels=None):
          """Update repodata from channels or use condarc channels if None."""
          norm_channels = self.conda_get_condarc_channels(channels=channels,
                                                          normalize=True)
          repodata_urls = self._set_repo_urls_from_channels(norm_channels)
          self._check_repos(repodata_urls)