This avoids an issue with u-root 7.0.0 which has been retracted by the
author:

  $ go list -u -m all
  $ go list -m: github.com/u-root/u-root@v7.0.0+incompatible: retracted by module author: Published v7 too early (before migrating to go modules)
Signed-off-by: Dirk Müller <dirk@dmllr.de>
(cherry picked from commit 93ca992c)
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>