Updated ordering.unittests.csproj file

src/Services/Ordering/Ordering.UnitTests/Ordering.UnitTests.csproj

@@ -9,7 +9,7 @@
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+    <PackageReference Include="Microsoft.NETCore.Platforms" Version="6.0.0-preview.7.21377.19" />
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     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
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