Update to stable version of Microsoft.NET.Test.Sdk

Author: akoeplinger

tests/Mono.Unix.Tests/Mono.Unix.Tests.csproj

@@ -17,6 +17,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.4.0-preview-20220726-02" />
+    <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.4.0" />
   </ItemGroup>
 </Project>