Fix an error for Naming/InclusiveLanguage string with invalid byte sequence in UTF-8

[ydah]

This fixes an issue when CheckStrings: true and string with invalid byte sequence in UTF-8
would cause an error in the Naming/InclusiveLanguage cop.

In fact, when we ran RuboCop on this repository's own code as follows, an error occurred.

rubocop.yml

Naming/InclusiveLanguage:
+  CheckStrings: true
  FlaggedTerms:
    behaviour:
      Suggestions:
        - behavior
    offence:
      Suggestions:
        - offense
  Exclude:
    - lib/rubocop/cop/naming/inclusive_language.rb

command

bundle exec rubocop --only Naming/InclusiveLanguage

result

6 errors occurred:
An error occurred while Naming/InclusiveLanguage cop was inspecting /Users/ydah/rubocop/spec/rubocop/cop/layout/end_of_line_spec.rb.
An error occurred while Naming/InclusiveLanguage cop was inspecting /Users/ydah/rubocop/spec/rubocop/cop/lint/percent_string_array_spec.rb.
An error occurred while Naming/InclusiveLanguage cop was inspecting /Users/ydah/rubocop/spec/rubocop/cop/lint/percent_symbol_array_spec.rb.
An error occurred while Naming/InclusiveLanguage cop was inspecting /Users/ydah/rubocop/spec/rubocop/cop/lint/syntax_spec.rb.
An error occurred while Naming/InclusiveLanguage cop was inspecting /Users/ydah/rubocop/spec/rubocop/path_util_spec.rb.
An error occurred while Naming/InclusiveLanguage cop was inspecting /Users/ydah/rubocop/spec/rubocop/result_cache_spec.rb.
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:
1.29.0 (using Parser 3.1.2.0, rubocop-ast 1.17.0, running on ruby 3.1.0 x86_64-darwin21)

---

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.

[koic]

Good catch!