Fix dry run credentials check (#3137)

            echo "Crates to publish not found!"

            exit 1

          fi

          # The following owner list command fails without a valid crates.io auth token

          echo "Checking cargo auth token..."

          cargo owner --list aws-smithy-types

          # This version has already been yanked. This command succeeds if we have a token with permission to yank the crate.

          cargo yank aws-sigv4 --version 0.55.0

        else

          publisher publish -y --location .

        fi