Don't use 's for multi-line vml

Author: jcansdale

azure-pipelines.yml

@@ -79,8 +79,8 @@ steps:
 - task: CopyFiles@2
   inputs:
     contents: |
-      '$(Build.SourcesDirectory)\build\$(buildConfiguration)\*.vsix'
-      '$(Build.SourcesDirectory)\build\$(buildConfiguration)\*.json'
+      $(Build.SourcesDirectory)\build\$(buildConfiguration)\*.vsix
+      $(Build.SourcesDirectory)\build\$(buildConfiguration)\*.json
     targetFolder: $(Build.ArtifactStagingDirectory)
 
 - task: PublishBuildArtifacts@1