actions/sync/shared-config: fix ci-orchestrator repository name.

This was changed and I forgot to update it so it's trying to incorrectly
sync rubocop files now.

Author: MikeMcQuaid

.github/actions/sync/shared-config.rb

@@ -113,7 +113,7 @@ def git(*args)
   ruby-macho
 ].freeze
 custom_rubocop_repos = %w[
-  ci-orchestrator
+  ci-orchestrator-private
   ruby-macho
 ].freeze
 rejected_docs_basenames = %w[