FreezeTime cop conflicts with local variable travel_to

[mikdiet]

Expected behavior

I have local rspec definition, which named the same as FreezeTime subject method named: travel_to.
I use it with Timecop gem.

let(:travel_to) { 47.hours.ago }

around { |example| Timecop.travel(travel_to) { example.run } }

I expect this won't violate FreezeTime cop

Actual behavior

I'm getting

An error occurred while Rails/FreezeTime cop was inspecting /path/to/test.
undefined method `children' for nil:NilClass

          child_node, method_name, time_argument = *node.first_argument.children
                                                                       ^^^^^^^^^
/Users/mikdiet/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/rubocop-rails-2.16.1/lib/rubocop/cop/rails/freeze_time.rb:46:in `on_send'

Steps to reproduce the problem

Just run rubocop on the code snippet provided.

If I change name, error is gone.

RuboCop version

$ [bundle exec] rubocop -V
1.36.0 (using Parser 3.1.2.1, rubocop-ast 1.21.0, running on ruby 3.1.2) [x86_64-darwin21]
  - rubocop-performance 1.15.0
  - rubocop-rails 2.16.1
  - rubocop-rspec 2.13.2
  - rubocop-sorbet 0.6.11