Update dependency cucumber-cucumber-expressions to v18

Author: renovate[bot]

cucumber.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'builder', '~> 3.2'
   s.add_dependency 'cucumber-ci-environment', '> 9', '< 11'
   s.add_dependency 'cucumber-core', '~> 15.0'
-  s.add_dependency 'cucumber-cucumber-expressions', '~> 17.0'
+  s.add_dependency 'cucumber-cucumber-expressions', '~> 18.0'
   s.add_dependency 'cucumber-html-formatter', '> 20.3', '< 22'
   s.add_dependency 'diff-lcs', '~> 1.5'
   s.add_dependency 'logger', '~> 1.6'