Update dependency rack to v3.1.6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

chef-windows/Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rake'
-gem 'rack', '3.1.5'
+gem 'rack', '3.1.6'
 gem 'inspec', '~> 5'
 gem 'rubocop', '~> 1.64.0'
 gem 'highline', '~> 2.1.0'