Revert "Merge branch 'sh-update-grape-gem' into 'master'"

.rubocop.yml

Gemfile

Gemfile.lock

changelogs/unreleased/sh-update-grape-gem.yml

doc/development/api_styleguide.md

doc/development/ee_features.md

ee/lib/api/analytics/code_review_analytics.rb

ee/lib/api/analytics/group_activity_analytics.rb

ee/lib/api/audit_events.rb

ee/lib/api/composer_packages.rb

ee/lib/api/conan_packages.rb

ee/lib/api/dependencies.rb

ee/lib/api/dependency_proxy.rb

ee/lib/api/elasticsearch_indexed_namespaces.rb

ee/lib/api/epic_issues.rb

ee/lib/api/epic_links.rb

ee/lib/api/epics.rb

ee/lib/api/feature_flag_scopes.rb

ee/lib/api/feature_flags.rb

ee/lib/api/feature_flags_user_lists.rb