Reapply "Rails 8 will target Ruby 3.3+ only for new apps"

This reverts commit 64ab211.

Author: rafaelfranca

railties/lib/rails/generators/rails/app/templates/Gemfile.tt

@@ -51,11 +51,6 @@ end
 group :development do
   # Use console on exceptions pages [https://github.com/rails/web-console]
   gem "web-console"
-<%- if RUBY_VERSION < "3.2" -%>
-
-  # Highlight the fine-grained location where an error occurred [https://github.com/ruby/error_highlight]
-  gem "error_highlight", ">= 0.4.0", platforms: [:ruby]
-<%- end -%>
 end
 <%- end -%>