Allow casks to depend on ARM

[fxcoudert]

Fix a second failure on Big Sur ARM (#9066):

  2) Satisfy Dependencies and Requirements depends_on arch when satisfied does not raise an error
     Failure/Error: expect { install }.not_to raise_error
     
       expected no Exception, got #<Cask::CaskError: Cask with-depends-on-arch depends on hardware architecture being one of [{:type=>:intel, :bits=>64}], but you are running {:type=>:arm, :bits=>64}> with backtrace:
         # ./cask/installer.rb:272:in `arch_dependencies'
         # ./cask/installer.rb:251:in `satisfy_dependencies'
         # ./cask/installer.rb:66:in `fetch'
         # ./cask/installer.rb:94:in `install'
         # ./test/cask/depends_on_spec.rb:8:in `block (2 levels) in <top (required)>'
         # ./test/cask/depends_on_spec.rb:73:in `block (5 levels) in <top (required)>'
         # ./test/cask/depends_on_spec.rb:73:in `block (4 levels) in <top (required)>'
         # ./test/support/helper/spec/shared_context/homebrew_cask.rb:52:in `block (2 levels) in <top (required)>'
         # ./test/spec_helper.rb:194:in `block (3 levels) in <top (required)>'
         # ./test/spec_helper.rb:193:in `block (2 levels) in <top (required)>'
         # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:124:in `block in run'
         # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `loop'
         # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `run'
         # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
         # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:37:in `block (2 levels) in setup'
         # ./vendor/bundle/ruby/2.6.0/gems/rspec-wait-0.0.9/lib/rspec/wait.rb:46:in `block (2 levels) in <top (required)>'
     # ./test/cask/depends_on_spec.rb:73:in `block (4 levels) in <top (required)>'
     # ./test/support/helper/spec/shared_context/homebrew_cask.rb:52:in `block (2 levels) in <top (required)>'
     # ./test/spec_helper.rb:194:in `block (3 levels) in <top (required)>'
     # ./test/spec_helper.rb:193:in `block (2 levels) in <top (required)>'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:124:in `block in run'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `loop'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:110:in `run'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-retry-0.6.2/lib/rspec/retry.rb:37:in `block (2 levels) in setup'
     # ./vendor/bundle/ruby/2.6.0/gems/rspec-wait-0.0.9/lib/rspec/wait.rb:46:in `block (2 levels) in <top (required)>'