Preparing for 5.2.6.3 release

actioncable/lib/action_cable/gem_version.rb

actioncable/package.json

actionmailer/lib/action_mailer/gem_version.rb

actionpack/lib/action_pack/gem_version.rb

actionview/lib/action_view/gem_version.rb

actionview/package.json

activejob/lib/active_job/gem_version.rb

activemodel/lib/active_model/gem_version.rb

activerecord/lib/active_record/gem_version.rb

activestorage/lib/active_storage/gem_version.rb

activestorage/package.json

activesupport/lib/active_support/gem_version.rb

railties/lib/rails/gem_version.rb

version.rb