Don't install berks now that it's in omnibus-toolchain
Don't install berks now that it's in omnibus-toolchain

The berks install is causing failures since it deps on chef/chef and
pulls in the latest which only works on Ruby 2.7+

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

chef/supermarket,chef/supermarket,chef/supermarket,chef/supermarket,chef/supermarket