Merge pull request #450 from System-IO-Abstractions/dependabot/nuget/Microsoft.NET.Test.Sdk-16.0.0

Bump Microsoft.NET.Test.Sdk from 15.9.0 to 16.0.0

Author: robkeim

System.IO.Abstractions.TestingHelpers.Tests/System.IO.Abstractions.TestingHelpers.Tests.csproj

@@ -41,7 +41,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' != 'net40'">
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.0" />
     <PackageReference Include="Moq" Version="4.10.1" />
   </ItemGroup>