Rubocop dependency update to make VSC extension play well with it

[knightq]

The current gemspec rubocop dependency is set to ~> 1.32.0 locking rubocop to a version which has been released on July 21, 2022.
Any plans to relax the dependency specification to perhaps '>= 1.56.0'?

The real problem for us is that the official VSC extension for Rubocop requires at least version 1.53.0 of rubocop:

[client]   Version reported by `bundle exec rubocop -v`: 1.32.0 (>= 1.53.0 required)

otherwise it doesn't work and we miss the chance to have Rubocop running directly in the IDE.