Upgrade rubocop (#710)

Author: santib

.rubocop.yml

@@ -1,4 +1,4 @@
-require:
+plugins:
   - rubocop-minitest
   - rubocop-performance
   - rubocop-rake

rack-attack.gemspec

@@ -34,10 +34,10 @@ Gem::Specification.new do |s|
   s.add_development_dependency "minitest-stub-const", "~> 0.6"
   s.add_development_dependency 'rack-test', "~> 2.0"
   s.add_development_dependency 'rake', "~> 13.0"
-  s.add_development_dependency "rubocop", "1.12.1"
-  s.add_development_dependency "rubocop-minitest", "~> 0.11.1"
-  s.add_development_dependency "rubocop-performance", "~> 1.10.2"
-  s.add_development_dependency "rubocop-rake", "~> 0.5.1"
+  s.add_development_dependency "rubocop", "1.82"
+  s.add_development_dependency "rubocop-minitest", "~> 0.38"
+  s.add_development_dependency "rubocop-performance", "~> 1.26"
+  s.add_development_dependency "rubocop-rake", "~> 0.7"
   s.add_development_dependency "timecop", "~> 0.9.1"
 
   # byebug only works with MRI