Remove redundant encoding

This magic comment is not needed anymore because the default encoding of
source code files assumed by Ruby 2 is utf-8, and the minimum required
Ruby version is 3.1

Autofixed with:
```
rubocop -a --only Style/Encoding
```

Author: tagliala

lib/money/currency.rb

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 require "json"
 require "money/currency/loader"
 require "money/currency/heuristics"

lib/money/currency/heuristics.rb

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 class Money
   class Currency
     module Heuristics

lib/money/money.rb

@@ -1,4 +1,3 @@
-# encoding: utf-8
 require "money/bank/variable_exchange"
 require "money/bank/single_currency"
 require "money/money/arithmetic"

lib/money/money/allocation.rb

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 class Money
   class Allocation
     # Splits a given amount in parts. The allocation is based on the parts' proportions

lib/money/money/formatter.rb

@@ -1,4 +1,3 @@
-# encoding: UTF-8
 require 'money/money/formatting_rules'
 
 class Money

lib/money/money/formatting_rules.rb

@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 class Money
   class FormattingRules
     def initialize(currency, *raw_rules)

lib/money/money/locale_backend.rb

@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 require 'money/locale_backend/errors'
 require 'money/locale_backend/legacy'
 require 'money/locale_backend/i18n'

money.gemspec

@@ -1,4 +1,3 @@
-# -*- encoding: utf-8 -*-
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "money/version"

spec/currency/heuristics_spec.rb

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 describe Money::Currency::Heuristics do
   describe "#analyze_string" do
     let(:it) { Money::Currency }

spec/currency/loader_spec.rb

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 describe Money::Currency::Loader do
   it "returns a currency table hash" do
     expect(subject.load_currencies).to be_a Hash