/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/ is in ruby-gir-ffi 0.9.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/g_error.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_arg_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_base_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_callable_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_callback_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_constant_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_enum_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_field_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_flags_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_function_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_interface_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_object_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_property_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_registered_type_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_repository.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_signal_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_struct_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_type_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_union_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_unresolved_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_value_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/i_vfunc_info.rb
/usr/lib/ruby/vendor_ruby/ffi-gobject_introspection/lib.rb