Revert "Workaround for Style/RedundantBegin when using JRuby 9.2"

[koic]

Summary

Revert 1533ece

Current RuboCop (1.52) requires Ruby 2.7+ and JRuby 9.4+. So JRuby 9.2 has been dropped from runtime version.

Additional Information

jruby/jruby#6642 has been resolved in JRuby 9.4:

# example.rb
require 'ripper'

class RipperParser < Ripper
  def on_parse_error(message)
    raise message
  end
end

RipperParser.new(<<~RUBY).parse
  foo do
    bar do
  end
rescue NameError
  converted << nil
end
RUBY

$ ruby -v
jruby 9.4.2.0 (3.1.0) 2023-03-08 90d2913fda Java HotSpot(TM) 64-Bit Server VM 25.271-b09 on 1.8.0_271-b09 +jit [x86_64-darwin]
$ ruby example.rb # No errors

---

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.

[bbatsov]

Thanks!