Update to using Chef Workstation 20.9.158

This includes newer cookstyle rules that we should be checking for.

Change-Id: I6f1bedfe30dd3455570b41862e01b0c928f5e565
Signed-off-by: Lance Albertson <lance@osuosl.org>

README.rst

@@ -30,7 +30,7 @@ Prerequisites
 -------------
 
 - Chef 15 or higher
-- `Chef Workstation`_ 20.8.111 or later
+- `Chef Workstation`_ 20.9.158 or later
 - `Vagrant`_ 2.0 or later with `VirtualBox>`_ or some other provider
 
 .. _Chef Workstation: https://downloads.chef.io/chef-workstation/

playbooks/pre-delivery.yaml

@@ -6,7 +6,7 @@
 
 - hosts: all
   vars:
-    release: 20.8.111
+    release: 20.9.158
     chef_workstation: chef-workstation_{{ release }}-1_amd64.deb
   tasks:
   - name: Fetch chef-workstation package

test/tempest/default/default_test.rb

@@ -1,5 +1,3 @@
-# # encoding: utf-8
-
 # Inspec test for openstack-chef
 
 # The Inspec reference, with examples and extensive documentation, can be