Workaround GitHub Action failure

Ubuntu 20.04 and 22.04 workflows are failing due to an error
which is hit when running apt-get update. Until the
problematic package is fixed apply the suggested workaround
described here:

https://github.com/orgs/community/discussions/47863

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #14530