Fix an error for Style/RequireOrder

[koic]

This PR fixes the following error for Style/RequireOrder when multiple require are not sorted:

$ cat example.rb
require 'd'
require 'a'
require 'b'
require 'c'

$ bundle exec rubocop --only Style/RequireOrder -A
Inspecting 1 file
An error occurred while Style/RequireOrder cop was inspecting
/Users/koic/src/github.com/koic/rubocop-issues/require_order/example.rb:4:0.
To see the complete backtrace run rubocop -d.
C

Offenses:

example.rb:2:1: C: [Corrected] Style/RequireOrder: Sort require in alphabetical order.
require 'a'
^^^^^^^^^^^
example.rb:3:1: C: [Corrected] Style/RequireOrder: Sort require in alphabetical order.
require 'b'
^^^^^^^^^^^
example.rb:4:1: C: [Corrected] Style/RequireOrder: Sort require in alphabetical order.
require 'c'
^^^^^^^^^^^

1 file inspected, 3 offenses detected, 3 offenses corrected

1 error occurred:
An error occurred while Style/RequireOrder cop was inspecting
/Users/koic/src/github.com/koic/rubocop-issues/require_order/example.rb:4:0.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop/rubocop/issues

Mention the following information in the issue report:
1.50.2 (using Parser 3.2.2.1, rubocop-ast 1.28.1, running on ruby 3.2.1) [x86_64-darwin19]

---

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.