Update InSpec to 4.18.51 and pin train to 3.2.0

Gemfile

@@ -53,6 +53,10 @@ end
 group(:omnibus_package) do
   gem "appbundler"
 
+  ## Until we resolve https://github.com/inspec/train/issues/548
+  gem "train", "=3.2.0"
+  gem "train-core", "=3.2.0"
+
   # Expeditor manages the version of chef released to Rubygems. We only release 'stable' chef
   # gems to Rubygems now, so letting this float on latest should always give us the latest
   # stable release. May have to re-pin around major version bumping time, or during patch
@@ -67,8 +71,8 @@ group(:omnibus_package) do
   gem "fauxhai", "~> 7.4"
 
   # inspec
-  gem "inspec-bin", "= 4.18.39" # the actual inspec CLI binary
-  gem "inspec", "= 4.18.39"
+  gem "inspec-bin", "~> 4.18" # the actual inspec CLI binary
+  gem "inspec", "~> 4.18"
 
   # test-kitchen and plugins
   gem "test-kitchen", ">= 2.0"

Gemfile.lock

@@ -303,6 +303,11 @@ GEM
       mixlib-shellout (>= 2.0, < 4.0)
       tomlrb (~> 1.2)
     chef-sugar (5.1.9)
+    chef-telemetry (1.0.2)
+      chef-config
+      concurrent-ruby (~> 1.0)
+      ffi-yajl (~> 2.2)
+      http (~> 2.2)
     chef-utils (15.7.31)
     chef-vault (4.0.1)
     chef-zero (14.0.17)
@@ -380,7 +385,7 @@ GEM
     faraday-cookie_jar (0.0.6)
       faraday (>= 0.7.4)
       http-cookie (~> 1.0.0)
-    faraday_middleware (0.12.2)
+    faraday_middleware (0.14.0)
       faraday (>= 0.7.4, < 1.0)
     fauxhai (7.4.0)
       net-ssh
@@ -443,18 +448,26 @@ GEM
     hashie (3.6.0)
     highline (1.7.10)
     htmlentities (4.3.4)
+    http (2.2.2)
+      addressable (~> 2.3)
+      http-cookie (~> 1.0)
+      http-form_data (~> 1.0.1)
+      http_parser.rb (~> 0.6.0)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
+    http-form_data (1.0.3)
+    http_parser.rb (0.6.0)
     httpclient (2.8.3)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     ice_nine (0.11.2)
     inifile (3.0.0)
     iniparse (1.4.4)
-    inspec (4.18.39)
+    inspec (4.18.51)
       addressable (~> 2.4)
+      chef-telemetry (~> 1.0)
       faraday (>= 0.9.0)
-      faraday_middleware (~> 0.12.2)
+      faraday_middleware (~> 0.12)
       hashie (~> 3.4)
       htmlentities
       json-schema (~> 2.8)
@@ -465,7 +478,7 @@ GEM
       parallel (~> 1.9)
       parslet (~> 1.5)
       pry (~> 0)
-      rspec (~> 3.0, < 3.9)
+      rspec (~> 3.9)
       rspec-its (~> 1.2)
       rubyzip (~> 1.2, >= 1.2.2)
       semverse
@@ -479,8 +492,8 @@ GEM
       train-winrm (~> 0.2)
       tty-prompt (~> 0.17)
       tty-table (~> 0.10)
-    inspec-bin (4.18.39)
-      inspec (= 4.18.39)
+    inspec-bin (4.18.51)
+      inspec (= 4.18.51)
     ipaddress (0.8.3)
     iso8601 (0.12.1)
     jaro_winkler (1.5.4)
@@ -712,22 +725,22 @@ GEM
       addressable (>= 2.3.6, < 3.0.0)
     retriable (3.1.2)
     retryable (3.0.5)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.2)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.6)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
+    rspec-expectations (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
+      rspec-support (~> 3.9.0)
     rspec-its (1.3.0)
       rspec-core (>= 3.0.0)
       rspec-expectations (>= 3.0.0)
-    rspec-mocks (3.8.2)
+    rspec-mocks (3.9.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.3)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.2)
     rubocop (0.75.1)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
@@ -980,8 +993,8 @@ DEPENDENCIES
   ffi-rzmq-core
   foodcritic (>= 16.0)
   guard
-  inspec (= 4.18.39)
-  inspec-bin (= 4.18.39)
+  inspec (~> 4.18)
+  inspec-bin (~> 4.18)
   kitchen-azurerm (>= 0.14)
   kitchen-digitalocean (>= 0.10.0)
   kitchen-dokken (>= 2.8.1)