Better version constraint for Ruby 2.6 patch
Better version constraint for Ruby 2.6 patch

Make sure this only applies to 2.6

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

chef/omnibus-software,chef/omnibus-software,chef/omnibus-software,chef/omnibus-software,chef/omnibus-software,chef/omnibus-software