Update `rake` to 13.2

Vitaly Slobodinrequested to merge
vs/update-rake-13 into master

Update rake gem to 13.2 to unblock the upgrade path for the gitlab-dangerfiles gem that depends on rake@12:

Because gitlab-dangerfiles >= 4.3.2 depends on rake ~> 13.0
  and Gemfile depends on gitlab-dangerfiles ~> 4.8.0,
  rake ~> 13.0 is required.
So, because Gemfile depends on rake ~> 12.3,
  version solving has failed.

There are no breaking changes according to the changelog - https://github.com/ruby/rake/blob/master/History.rdoc#1300-

See #42 (closed) for more information.

Edited by Vitaly Slobodin

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