Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.83.0 to 0.84.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.83.0...v0.84.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

audit: Migrate scheme checks for `cvs`, `bzr`, `hg`, `fossil` and `svn+http` to `Rubocop` + add tests

formula_installer: fix build/test reqs not being pruned correctly

Fixes #7618.

formula_installer: fix already-satisfied test deps not being pruned

formula_installer: fix :test requirement expansion.

add compsys cache for brew casks

os/mac/diagnostic: suggest untapping phinze/cask.

As seen in https://github.com/Homebrew/brew/issues/7605.

audit: remove incorrect TODO.

Further test dep fixes

This check can't really be in RuboCop (as it relies on the URL strategy
logic).

Added analytics for cask info

Filtering for this is now handled properly in places where this function is used.

In some scenarios, we _want_ test deps on more than the first level (Homebrew.args.include_formula_test_deps?).

brew doctor shows deleted formulae

Further tweak :test dependency handling

- ensure that cases where `:build` and `:test` both apply to a
  dependency that we handle it appropriately
- fix reintroduced regression
  (https://github.com/Homebrew/brew/pull/6471#issuecomment-533414923).
  Fixes #6470.

formula_installer: fix test dependencies.

Only prune test dependencies from the tree when they aren't also build
dependencies (and vice-versa with build dependencies) and the include
test argument hasn't been passed.

bottle_arch: ensure a symbol is used when needed.

Fixes #7597.

Set up Byebug debugger

audit: Port some version checks to RuboCop

Specify the stance on mocks in test blocks