Merge pull request #9261 from reitermarkus/system_command-types

Library/Homebrew/context.rb

Library/Homebrew/sorbet/plugins/using.rb

Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi

Library/Homebrew/sorbet/triggers.yml

Library/Homebrew/system_command.rb

...ebrew/test/cask/artifact/shared_examples/uninstall_zap.rb

Library/Homebrew/test/cask/dsl/postflight_spec.rb

Library/Homebrew/test/cask/dsl/preflight_spec.rb

Library/Homebrew/test/cask/dsl/shared_examples/staged.rb

Library/Homebrew/test/cask/dsl/uninstall_postflight_spec.rb

Library/Homebrew/test/cask/dsl/uninstall_preflight_spec.rb

Library/Homebrew/test/cask/pkg_spec.rb

.../Homebrew/test/support/helper/cask/fake_system_command.rb

.../test/support/helper/spec/shared_context/homebrew_cask.rb