(maint) Removing 'pending' for bundle management acceptance

The pending test for bundle management fails on appveyor because it
actually passes due to the presence of devkit.
This test should not be pending - there should be a devkit installed.
The test can be manually ignored on workstations that don't/can't have
devkit.

spec/acceptance/bundle_management_spec.rb

@@ -11,14 +11,11 @@
     end
 
     describe command('pdk test unit') do
-      its(:exit_status) { pending 'json install requires ruby devkit' if Gem.win_platform?; is_expected.to eq 0 }
-      its(:stderr) do
-        pending 'json install requires ruby devkit' if Gem.win_platform?
-        is_expected.to match(%r{Checking for missing Gemfile dependencies}i)
-      end
+      its(:exit_status) { is_expected.to eq 0 }
+      its(:stderr) { is_expected.to match(%r{Checking for missing Gemfile dependencies}i) }
 
       describe file('Gemfile.lock') do
-        it { pending 'json install requires ruby devkit' if Gem.win_platform?; is_expected.to be_file }
+        it { is_expected.to be_file }
       end
     end
   end