Bump NuGet.Packaging in /test/coverlet.integration.tests (#1616)

Bumps [NuGet.Packaging](https://github.com/NuGet/NuGet.Client) from 6.6.1 to 6.6.2.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.Packaging
  dependency-type: direct:production
...

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test/coverlet.integration.tests/coverlet.integration.tests.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0"/>
     <PackageReference Include="Moq" Version="4.20.70"/>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-    <PackageReference Include="NuGet.Packaging" Version="6.6.1"/>
+    <PackageReference Include="NuGet.Packaging" Version="6.6.2"/>
     <PackageReference Include="xunit" Version="2.6.5"/>
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6"/>
     <PackageReference Include="System.Buffers" Version="4.5.1" />