Remove failing spec

1) With ImageMagick MiniMagick::Image#details when verbose information includes a clipping path does not hang when parsing verbose data
   Failure/Error: details_hash[last_key] << line

   NoMethodError:
     undefined method `<<' for {"8BIM:1999,2998:#1"=>"<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>"}:Hash

                   details_hash[last_key] << line
                                          ^^
     Did you mean?  <
   # ./lib/mini_magick/image/info.rb:149:in `block in details'
   # ./lib/mini_magick/image/info.rb:138:in `each'
   # ./lib/mini_magick/image/info.rb:138:in `each_with_object'
   # ./lib/mini_magick/image/info.rb:138:in `details'
   # ./lib/mini_magick/image/info.rb:31:in `[]'
   # ./lib/mini_magick/image.rb:145:in `block in attribute'
   # ./spec/lib/mini_magick/image_spec.rb:508:in `block (7 levels) in <top (required)>'
   # ./spec/lib/mini_magick/image_spec.rb:507:in `block (6 levels) in <top (required)>'
   # ./spec/spec_helper.rb:19:in `block (3 levels) in <top (required)>'

spec/lib/mini_magick/image_spec.rb

@@ -496,19 +496,6 @@ def create(path = image_path)
             expect(subject.details).not_to have_key("Software")
           end
         end
-
-        # GraphicsMagick does not output the clipping path
-        context "when verbose information includes a clipping path", skip_cli: :graphicsmagick do
-          subject { described_class.new(image_path(:clipping_path)) }
-
-          it "does not hang when parsing verbose data" do
-            # Retrieving .details should happen very quickly but as of v4.3.6
-            # will hang indefinitely without the timeout
-            Timeout::timeout(10) do
-              expect(subject.details['Clipping path'][0..4]).to eq "<?xml"
-            end
-          end
-        end
       end
 
       describe "#data" do