Bump rake from 11.2.2 to 12.3.0

Bumps [rake](https://github.com/ruby/rake) from 11.2.2 to 12.3.0.
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v11.2.2...v12.3.0)

Gemfile.lock

@@ -45,7 +45,7 @@ GEM
     rack (2.0.1)
     rack-protection (2.0.0)
       rack
-    rake (11.2.2)
+    rake (12.3.0)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)