Fix lint workflow

[davidbeig]

Since rubocop inherits from the decidim rubocop config files, it broke after merging https://github.com/decidim/decidim/pull/13146.

This PR fixes it. Basically we add rubocop-rspec_rails dependency, as well as adding rubocop-capybara as required file in .rubocop.yml to get rid of a message when executing it.

The missing gem is what updates the different gem versions.

This solution really does not make a lot of sense, since this is not a ror application, but in order to not duplicate the rubocop files in de decidim-dev this is the easiest solution.

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