Fix RuboCop autocorrect for Windows compatibility

[andyw8]

Motivation / Background

New behaviour was added in #50506 which runs RuboCop after a generator, but the approach fails on Windows.

Detail

As documented in the Rails Guides, when calling a binstub on Windows, we need to prefix it with ruby:
https://guides.rubyonrails.org/getting_started.html#starting-up-the-web-server

Otherwise it will fail with:

D:/Ruby33-x64/lib/ruby/gems/3.3.0/bundler/gems/rails-fc4407eed00e/railties/lib/rails/configuration.rb:138:in `system': Exec format error - bin/rubocop -A --fail-level=E app/controllers/home_controller.rb app/helpers/home_helper.rb (Errno::ENOEXEC)
        from D:/Ruby33-x64/lib/ruby/gems/3.3.0/bundler/gems/rails-fc4407eed00e/railties/lib/rails/configuration.rb:138:in `block in apply_rubocop_autocorrect_after_generate!'
        from D:/Ruby33-x64/lib/ruby/gems/3.3.0/bundler/gems/rails-fc4407eed00e/railties/lib/rails/generators.rb:317:in `block in run_after_generate_callback'
        from D:/Ruby33-x64/lib/ruby/gems/3.3.0/bundler/gems/rails-fc4407eed00e/railties/lib/rails/generators.rb:316:in `each'

I am not a Windows user so I cannot fully test the fix myself, but it was reported here.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Unrelated changes should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.

cc @koic

[andyw8]

(CI failure seems unrelated)