Bump rake from 10.4.2 to 12.3.3

Bumps [rake](https://github.com/ruby/rake) from 10.4.2 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@v10.4.2...v12.3.3)

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

Author: dependabot[bot]

Gemfile

@@ -8,6 +8,6 @@ gem 'middleman-autoprefixer', '~> 2.4.4'
 gem 'rouge', '~> 1.9.0'
 gem 'redcarpet', '~> 3.3.2'
 
-gem 'rake', '~> 10.4.2'
+gem 'rake', '~> 12.3.3'
 gem 'therubyracer', '~> 0.12.1', platforms: :ruby
 gem 'json', '>=1.8.3'

Gemfile.lock

@@ -94,7 +94,7 @@ GEM
     rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
-    rake (10.4.2)
+    rake (12.3.3)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -137,7 +137,7 @@ DEPENDENCIES
   middleman-autoprefixer (~> 2.4.4)
   middleman-gh-pages (~> 0.0.3)
   middleman-syntax (~> 2.0.0)
-  rake (~> 10.4.2)
+  rake (~> 12.3.3)
   redcarpet (~> 3.3.2)
   rouge (~> 1.9.0)
   therubyracer (~> 0.12.1)