Bump rake from 10.5.0 to 12.3.3

Bumps [rake](https://github.com/ruby/rake) from 10.5.0 to 12.3.3.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v10.5.0...v12.3.3)

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

Gemfile

@@ -9,7 +9,7 @@ gem 'multi_json', '~> 1.0'
 gem 'oj', '~> 2.0'
 gem 'parseconfig'
 gem 'rack'
-gem 'rake', '~> 10.0'
+gem 'rake', '~> 12.3'
 gem 'sinatra', '~> 1.0'
 gem 'sinatra-advanced-routes'
 gem 'sinatra-contrib', '~> 1.0'

Gemfile.lock

@@ -260,7 +260,7 @@ GEM
       rack (>= 1.1, < 3.0)
       unicorn (~> 5.1)
     raindrops (0.19.1)
-    rake (10.5.0)
+    rake (12.3.3)
     rdf (1.0.8)
       addressable (>= 2.2)
     recursive-open-struct (1.1.3)
@@ -381,7 +381,7 @@ DEPENDENCIES
   rack-test
   rack-timeout
   rainbows
-  rake (~> 10.0)
+  rake (~> 12.3)
   redcarpet
   redis
   redis-activesupport