Bump rake from 12.0.0 to 12.3.1

Bumps [rake](https://github.com/ruby/rake) from 12.0.0 to 12.3.1.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v12.0.0...v12.3.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

Gemfile

@@ -69,5 +69,5 @@ group :development, :test do
 end
 
 group :staging do
-  gem 'rake', '~> 12.0.0'
+  gem 'rake', '~> 12.3.1'
 end

Gemfile.lock

@@ -301,7 +301,7 @@ GEM
     rainbow (2.2.2)
       rake
     raindrops (0.18.0)
-    rake (12.0.0)
+    rake (12.3.1)
     rdf (1.1.1.1)
     rdf-rdfxml (1.0.1)
       rdf (>= 1.0)
@@ -468,7 +468,7 @@ DEPENDENCIES
   rack-dev-mark (~> 0.7.5)
   rails (~> 4.2.7.1)
   rails_autolink (~> 1.1.6)
-  rake (~> 12.0.0)
+  rake (~> 12.3.1)
   responders (~> 2.4.0)
   rspec-activemodel-mocks (~> 1.0)
   rspec-mocks (= 3.6.0)