Improve Rails/TimeZone cop, don’t use String#to_time

[ydakuka]

Reference: https://rails.rubystyle.guide/#to-time

Actual behavior

I have the code:

# frozen_string_literal: true

class User < ApplicationRecord
  def method
    '2015-03-02 19:05:37'.to_time
  end
end

I will run rubocop and not get any offenses:

ydakuka@yauhenid:~/Work/project$ bin/rails_docker rubocop app/models/user.rb
Inspecting 1 file
.

1 file inspected, no offenses detected

Rubocop

ydakuka@yauhenid:~/Work/project$ bin/rails_docker rubocop -V
1.55.1 (using Parser 3.2.2.3, rubocop-ast 1.29.0, running on ruby 2.7.8) [x86_64-linux]
  - rubocop-capybara 2.18.0
  - rubocop-factory_bot 2.23.1
  - rubocop-performance 1.18.0
  - rubocop-rails 2.20.2
  - rubocop-rake 0.6.0
  - rubocop-rspec 2.23.0
  - rubocop-thread_safety 0.5.1