chore(deps): update dependency rubocop-rspec to '~> 2.31.0'

Author: renovate[bot]

ruby/cucumber-html-formatter.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', '~> 3.13'
   s.add_development_dependency 'rubocop', '~> 1.71.0'
   s.add_development_dependency 'rubocop-rake', '~> 0.6.0'
-  s.add_development_dependency 'rubocop-rspec', '~> 2.25.0'
+  s.add_development_dependency 'rubocop-rspec', '~> 2.31.0'
 
   s.executables      = ['cucumber-html-formatter']
   s.files            = Dir['README.md', 'LICENSE', 'lib/**/*', 'assets/*']