Fixup more frozen string handling.

Library/Homebrew/cask/artifact/abstract_uninstall.rb

Library/Homebrew/cask/cmd/abstract_command.rb

Library/Homebrew/cask/cmd/edit.rb

Library/Homebrew/cask/cmd/info.rb

Library/Homebrew/cask/installer.rb

Library/Homebrew/caveats.rb

Library/Homebrew/dev-cmd/bottle.rb

Library/Homebrew/dev-cmd/man.rb

Library/Homebrew/diagnostic.rb

Library/Homebrew/exceptions.rb

Library/Homebrew/formula_installer.rb

Library/Homebrew/missing_formula.rb

Library/Homebrew/test/formula_spec.rb

Library/Homebrew/test/inreplace_spec.rb

Library/Homebrew/test/string_spec.rb

Library/Homebrew/utils.rb

Library/Homebrew/utils/inreplace.rb