Use RuboCop RSpec 2.24

This commit uses RuboCop RSpec 2.24 and suppresses the following `RSpec/FilePath` error:

```console
$ bundle exec rubocop
Error: The `RSpec/FilePath` cop has been split into `RSpec/SpecFilePathFormat` and `RSpec/SpecFilePathSuffix`.
(obsolete configuration found in .rubocop.yml, please update it)
```

https://github.com/rubocop/rubocop-rspec/releases/tag/v2.24.0

.rubocop.yml

@@ -139,14 +139,16 @@ RSpec:
       - expect_no_offenses
       - expect_offense
 
-RSpec/FilePath:
-  Exclude:
-    - spec/rubocop/cop/internal_affairs/redundant_let_rubocop_config_new_spec.rb
-    - spec/rubocop/formatter/junit_formatter_spec.rb
-
 RSpec/PredicateMatcher:
   EnforcedStyle: explicit
 
+RSpec/SpecFilePathFormat:
+  CustomTransform:
+    JUnitFormatter: junit_formatter
+    RedundantLetRuboCopConfigNew: redundant_let_rubocop_config_new
+  Exclude:
+    - spec/rubocop/cop/mixin/enforce_superclass_spec.rb
+
 RSpec/MessageSpies:
   EnforcedStyle: receive
 

Gemfile

@@ -12,7 +12,7 @@ gem 'rake', '~> 13.0'
 gem 'rspec', '~> 3.7'
 gem 'rubocop-performance', '~> 1.19.0'
 gem 'rubocop-rake', '~> 0.6.0'
-gem 'rubocop-rspec', '~> 2.23.0'
+gem 'rubocop-rspec', '~> 2.24.0'
 # Workaround for cc-test-reporter with SimpleCov 0.18.
 # Stop upgrading SimpleCov until the following issue will be resolved.
 # https://github.com/codeclimate/test-reporter/issues/418

spec/rubocop/cop/mixin/enforce_superclass_spec.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-# rubocop:disable RSpec/FilePath
 RSpec.describe RuboCop::Cop::EnforceSuperclass, :restore_registry do
   subject(:cop) { cop_class.new(configuration) }
 
@@ -117,4 +116,3 @@ class MyModel < ::ActiveRecord::Base
     RUBY
   end
 end
-# rubocop:enable RSpec/FilePath