Bump vmstat from 2.3.0 to 2.3.1

Bumps [vmstat](http://threez.github.com/ruby-vmstat/) from 2.3.0 to 2.3.1.

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -39,7 +39,7 @@ gem 'steno'
 gem 'talentbox-delayed_job_sequel', '~> 4.3.0'
 gem 'thin'
 gem 'unf'
-gem 'vmstat', '~> 2.0'
+gem 'vmstat', '~> 2.3'
 gem 'yajl-ruby'
 
 # Rails Components

Gemfile.lock

@@ -472,7 +472,7 @@ GEM
     unicode-display_width (1.6.1)
     vhd (0.0.4)
       bit-struct
-    vmstat (2.3.0)
+    vmstat (2.3.1)
     webmock (3.5.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
@@ -571,7 +571,7 @@ DEPENDENCIES
   timecop
   unf
   vcap-concurrency!
-  vmstat (~> 2.0)
+  vmstat (~> 2.3)
   webmock (> 2.3.1)
   yajl-ruby