Some arriving, some leaving.

build: bump rubocop from 0.75.0 to 0.75.1 in /Library/Homebrew

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.75.0 to 0.75.1.
- [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/v0.75.0...v0.75.1

)

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

Raise deprecation exceptions in tests

Previously tests which hit `odeprecated` would print warnings but not
always raise exceptions or fail. Combine this with the ability to have
`odeprecated` to turn into `odisabled` on certain dates and you have
tests that may fail just on the clock changing (this is bad).

Instead, ensure that tests always raise deprecations as exceptions so
that new deprecations will have their tests handled immediately.

Cask: only quarantine working symlinks

Fixes Homebrew/homebrew-cask#70796

Move condition to nested `if` statement.

Fix `Dmg` detection.

Bump Rubocop's `TargetRubyVersion` to 2.6 and fix all offenses

upgrade: reject formulae checked in earlier levels

- Only try to call `.match?` on strings that aren't nil.

Fix `Dmg` being detected as `Tar`.

- To have the audit commands continue to work, and the tests passing
  (the previous error was [1]), everywhere we're trying to
  `.match?(text)`, instead do `.match?(text.to_s)`.

[1] 5) Homebrew::FormulaAuditor#audit_file __END__ but no DATA
    Failure/Error: fa.audit_file

    TypeError:
      no implicit conversion of Homebrew::FormulaText into String
    # ./dev-cmd/audit.rb:267:in `match?'
    # ./dev-cmd/audit.rb:267:in `audit_file'
    # ./test/dev-cmd/audit_spec.rb:137:in `block (3 levels) in <module:Homebrew>'

- The final two `brew style` offenses were for Metrics/LineLength where
  parsing the GitHub diff URL as a regex took 119/118 lines.
- This disables the cop for each of those long, problematic lines, and
  re-enables them straight afterwards, else they'd apply to the whole file
  from the first occurrence onwards, which we probably don't want?
- I wondered about increasing the LineLength limit to 119 or 120, but
  it appears to have been set for a justifiable reason in 80d75bc0.

- These didn't appear in the first pass as the other offense fixes caused them.

- This also required auto-fixes for Layout/EmptyLinesAroundBlockBody and
  Layout/InconsistentIndentation once the auto-fixer had got rid of the
  "redundant begin"s.

- This was set to 2.3 because Homebrew was running Ruby 2.3.7. Since
  https://github.com/Homebrew/brew/pull/6556, we're running 2.6.3. With
  this change, Rubocop will check against modern Ruby syntax.

bash completion example should not call brew if brew doesn't exist

remove /usr/bin/xattr unsupported -s option in macOS 10.15

Remove uneeded warning when searching for a cask migrated from formula