Updates rubocop gems

- Manually specifies minor version so it doesn't automatically update minor verison during CI tests.
- Updates other rubocop gems.
- Updates tests to resolve cop

paper_trail.gemspec

@@ -44,9 +44,9 @@ has been destroyed.
   s.add_development_dependency "paper_trail-association_tracking", "~> 2.0.0"
   s.add_development_dependency "rake", "~> 13.0"
   s.add_development_dependency "rspec-rails", "~> 4.0"
-  s.add_development_dependency "rubocop", "~> 0.85.1"
-  s.add_development_dependency "rubocop-performance", "~> 1.4"
-  s.add_development_dependency "rubocop-rspec", "~> 1.35"
+  s.add_development_dependency "rubocop", "~> 0.88.0"
+  s.add_development_dependency "rubocop-performance", "~> 1.7.1"
+  s.add_development_dependency "rubocop-rspec", "~> 1.42.0"
 
   # ## Database Adapters
   #

spec/models/version_spec.rb

@@ -12,7 +12,7 @@ module PaperTrail
         specify { expect(PaperTrail.serializer).to be PaperTrail::Serializers::YAML }
 
         it "store out as a plain hash" do
-          expect(value =~ /HashWithIndifferentAccess/).to be_nil
+          expect(value).not_to include("HashWithIndifferentAccess")
         end
       end
 
@@ -46,7 +46,7 @@ module PaperTrail
         end
 
         it "store out as a plain hash" do
-          expect(value =~ /HashWithIndifferentAccess/).to be_nil
+          expect(value).not_to include("HashWithIndifferentAccess")
         end
 
         after do