MONGOID-5143 [Code Comments Only] Remove magic comment "# encoding: utf-8" (#5041)

* Remove magic comment "# encoding: utf-8".

It has not had any affect since Ruby 2.1, as that version made UTF-8 the default encoding. Min ruby we support is 2.3, so this is fine to remove.

* Commmit missed files

Co-authored-by: shields <shields@tablecheck.com>

Author: johnnyshields

examples/mongoid_test.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 require 'mongoid'
 require 'mongoid/support/query_counter'

lib/mongoid.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 require "support/ruby_version"
 

lib/mongoid/association.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 require 'mongoid/association/accessors'
 require 'mongoid/association/builders'

lib/mongoid/association/accessors.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 module Mongoid
   module Association

lib/mongoid/association/bindable.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 module Mongoid
   module Association

lib/mongoid/association/builders.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 module Mongoid
   module Association

lib/mongoid/association/constrainable.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 module Mongoid
   module Association

lib/mongoid/association/depending.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 module Mongoid
   module Association

lib/mongoid/association/eager_loadable.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 require "mongoid/association/referenced/eager"
 

lib/mongoid/association/embedded.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-# encoding: utf-8
 
 require 'mongoid/association/embedded/cyclic'
 require 'mongoid/association/embedded/embedded_in'